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This ship measures ______ that one.
A) as twice as long B) as twice long as
C) twice long as D) twice as long as
答案
更多“This ship measures ______ that one. A) as twice as long B) as twice long as C) twice long”相关的问题
第1题
The model has shown that this radar system, known as laser-dopple radar, can measure with absolute precision speeds varying from spaceship orbital injection(进入) velocities(速度) of five miles per second down to virtual stops-speeds of less than one-thousandth of an inch per second. According to the scientists who are developing this system, such fine measures of velocity are of prime importance in space missions. In a rendezvous(对接) between two spaceships, or in a landing approach by a vehicle onto an orbiting space station, a bump could rip open a ship's skin, or a nudge could knock the station out of its orbit.
The light-beam radar, which operates at a frequency of trillions of cycles(百万兆) per second, could easily detect and measure the movement of a vehicle edging up to a satellite space station. A control system using so precise a signal as this would allow a huge vehicle to dock at a space station as lightly as a feather.
Laser-dopple radar ______.
A．measures the movement of a spaceship by means of light beam
B．makes use of microwaves
C．makes use of sound waves
D．both A and B
第2题
This is particularly significant in relation to hospital care. The physician must certify the need for hospitalization, determine what procedures will be performed, and announce when the patient may be discharged.The patient may be consulted about some of these decisions, but in the main it is the doctor' s judgments that are final. Little wonder then that in the eyes of the hospital it is the physician who is the real "consumer. "As a consequence, the medical staff represents the "power center" in hospital policy and decision-making, not the administration.
Although usually there are in this situation four identifiable participants, the physician, the hospital, the patient and the payer(generally an insurance carrier or government), the physician makes the essential decision for all of them. The hospital becomes an extension of the physicians; the payer generally meets most of the bona fide bills generated by the physician/hospital and for the most part, the patient's plays a passive role. In routine or minor illness or just plain worries, the patient's options are of course, much greater with respect to use and price. But in illnesses that are of some significance, such choice tends to evaporate. And it is for these illnesses that the bulk of the health care dollar is spent. We estimate that about 75 N 80 percent of health care expenditures are determined by physicians, not patients. For this reason, economy measures directed at patients or the general public are relatively ineffective.
The author's primary purpose is______。
A．to criticize doctors for exercising too much control over patients
B．to analyze some important economic factors in health care
C．to urge hospitals to reclaim their decision-making authority
D．to inform. potential patients of their health care rights
第3题
This week a Russian and American consortium will announce plans for an April launch of the first so-called solar-sail vehicle, a multicasted spacecraft that will use sunlight to push itself along. To a public raised on smoke-and-fire rocketry, the idea of drawing energy straight from space seems fanciful. To the people behind the new ship, however, the technology is not only sensible but inevitable, the easiest way to reinvent the business of cosmic travel. "This allows us to use very little fuel to fly very great distances," says Bud Schurmeier, a former NASA engineer and an adviser to the project. "It's an intriguing concept."
The idea behind solar sailing is simple. Although light is made of massless particles called photons, such ephemeral things exert real pressure, especially when they flow so close a source as the sun. Attach a sail of lightweight Mylar or other material to a spacecraft, set it up in the path of that outrushing energy, and you ought to be able to move in almost any direction.
NASA has a keen interest in solar sailing and had budgeted $ 5 million to investigate 17 possible missions. It may select one as early as next month. But while the space agency has been mulling plans, the people behind the new ship, dubbed Cosmos I, have been getting set to fly. The project is the brainchild of Russia's Babakin Space Center, near Moscow, and the Planetary Society in Pasadena, Calif., a think tank founded in 1979 by astronomer Carl Sagan and others. The two groups had long been developing plans for a solar-sail mission but got the cash to make it happen only last year when Ann Druyan, Sagan's widow and head of the Media Company Cosmos Studios, and Joe Firmage, the founder of US Web, threw their names and about $ 4 million behind the effort. "I had talked to people about solar sailing before," says Lou Friedman , former engineer at the Jet Propulsion Laboratory in Pasadena and director of the Planetary Society," but between the Russians' capabilities and Ann's vision, I knew this one would click."
The spacecraft is a 3-ft. metal with eight 35-ft. metallic wings. Mylar petals sprout from it -- though the prototype used in the April launch will have just two petals. Mounted atop a reconfigured Russian ICBM and launched from a sub in the Barents Sea, the Cosmos I will fly to an altitude of 260 miles, where it will deploy the wings and float for a minute of so. If all goes well, the wings will then be jettisoned and the sphere aerobraked back to Earth, its bounce-down on Russian soil cushioned by air bags.
By some measures, this cosmic lob shot is not that impressive, but for solar-sail scientists, the engineering is everything. Few doubt that when sunlight strikes the wings, the spacecraft will accelerate; the key is building wings that can open and pivot, allowing the ship to tack into the solar stream. If this mission works, a more ambitious orbital flight, using the eight-paneled craft, is set for the end of the year. The space-craft could circle Earth for months, surfing the sun until de signers shut it down. "There will be a grandeur to it, "says Druyan, "a 70-ft. sail that will be visible to the whole planet."
Grandeur aside, critics wonder if solar sails have a future. The technique is problematic in Earth orbit, since the changing position of sun relative to the space-craft makes constant tacking necessary. Sailing is best used for as the crow-flies shots to neighboring planets. Even in these cases, progress can be slow, since sunlight exerts, at most, 2 lbs. of pressure per square haft-mile, requiring a year or more to rev a spacecraft to interplanetary speeds. Worse,
A．Sunlight.
B．Nuclear.
C．Wind.
D．Electricity.
第4题
第三篇
In most sectors of the economy, it is the seller who attempts to attract a potential buyer with various inducements of price, quality and utility, and it is the buyer who makes the decision. In the health care industry, however, the doctor-patient relation- ship is the mirror image of the ordinary relationship between producer and consumer. Once an individual has chosen to see a physician, the physician usually makes all significant purchasing decisions: whether the patient should return "nest Wednesday" whether X-rays are needed, whether drugs should be prescribed, etc.
This is particularly significant in relation to hospital care. The physician must certify the need for hospitalization, determine what procedures will be performed, and announce when the patient may be discharged. The patient may be consulted about some of these decisions, but in the main it is the doctor' s judgments that are final. Little wonder then that in the eyes of the hospital it is the physician who is the real "consumer. "As a consequence, the medical staff represents the "power center" in hospital policy and decision-making, not the administration.
Although usually there are in this situation four identifiable participants, the physician, the hospital, the patient and the payer(generally an insurance carrier or government), the physician makes the essential decision for all of them. The hospital becomes an extension of the physicians; the payer generally meets most of the bona fide bills generated by the physician/hospital and for the most part, the patient's plays a passive role. In routine or minor illness or just plain worries, the patient's options are of course, much greater with respect to use and price. But in illnesses that are of some significance, such choice tends to evaporate. And it is for these illnesses that the bulk of the health care dollar is spent. We estimate that about 75 N 80 percent of health care expenditures are determined by physicians, not patients. For this reason, economy measures directed at patients or the general public are relatively ineffective.
The author's primary purpose is______。
A. to criticize doctors for exercising too much control over patients
B. to analyze some important economic factors in health care
C. to urge hospitals to reclaim their decision-making authority
D. to inform. potential patients of their health care rights
第5题
The US government will take measures to reduce the overall population risk.
A．Right
B．Wrong
C．Not mentioned
第6题
第7题
第8题
A.in some measures
B.in some measure
C.to some measure
D.with some measures
