第1题
The Greenwich Mean Time was set up in 1884.
A.Y
B.N
C.NG
第2题
A.Right
B.Wrong
C.Not mentioned
第5题
When is BBC's Overseas Students at British Universities on air every day?
A.6:30 AM.
B.8:30 GMT.
C.18:30 Greenwich Mean Time.
第6题
The name of the earliest palace was Placentia. Its windows were made of glass--the first in England. Herry Va loved placentia. But Henry understood the future of his country, too: he knew that England must be strong at sea. So he started two big shipyards at Greenwich, and for 350 years the ships made there were the best in the world.
In 1649, a war started in England and for eleven years there was no king. When the war ended, Placentia was falling down. So King Charles 1I built a new and bigger palace, which is now the Royal (皇家的) Naval College and is open to the public.
At this time, Charles was worried about losing so many of his ships at sea: Their sailors didn't know how to tell exactly where they were. So in 1675 Charles made John Flamsteed the first Astronomer (天文台) Royal, to try to find the answer. Flamsteed worked in a new Observatory (天文台) on the high ground in Greenwich Park. With a telescope he made himself, Flamsteed could look all around the sky. And he did, night after night, for twenty years. Carrying on Fiamsteed's work a hundred years later, an astronomer called Harrison (1693 - 1776) finally made a clock which told the time at sea; and helped sailors to know where they were. You can see Harrison’s clock, still working, in Greenwich’s museum of the sea. Because of Flamsteed’s work, every country in the world now tells its time by Greenwich time.
Who first lived in the place that is called Greenwich today according to this passage ? ______.
A.Henry Ⅷ
B.Romans
C.Charles Ⅱ
D.the Saxons
第8题
Those who visit London will certainly go to______.
A.the Tower of London
B.Harrods
C.Buckingham Palace
D.The Greenwich village
第9题
试判断能否用TTL电路直接驱动CMOS电路?如果不能,应采取什么措施?已知74LS系列门电路参数:VOL(max)=0.5 V,VOH(min)=2.7 V;74HCT系列参数:VIL(max)=0.8 V,VIH(min)=2 V;74HC系列参数:VIL(max)=1.5 V,VIH(min)=3.5 V。
第10题
由图3-12(课本图3—1—2),列出AHC、TTL、AHCT、3.3V ALVT、2.5V ALVT的VOH、VOL、VIH、VIL,计算它们的VNH及VNL。