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What could astronomers better estimate once they knew what nebulae really were？
A．The diameter of variable stars
B．The density of cosmic dust
C．The size of the universe
D．The average number of planets in a galaxy
答案
更多“What could astronomers better estimate once they knew what nebulae really were？A．The diame”相关的问题
第1题
A．People could choose to watch what they want.
B．People could be well-informed staying at home.
C．People could actually see the people and places talked about.
D．Television news came to people more quickly than radio news.
第2题
What happened to Senator Stems could happen to ______.
A．other old men
B．other senators
C．other politicians
D．anyone in the United States
第3题
He ate what he could, and gave the ______ of the food to the birds.
A．remain
B．uneaten
C．rest
D．part
第5题
第6题
A．People could choose to watch what they want.
B．People could be well informed staying at home.
C．People could actually see the people and places talked about.
D．Television news came to people more quickly than radio news.
第7题
A.brought；to
B.brought；on
C.brought；about
D.brought；forward
第8题
What could he do ______ what he had said？
A．was to take back
B．but to take back
C．but take back
D．was take back
第9题
What could the two speakers be？
A．PE coaches.
B．Sports fans.
C．Sports experts.
D．Sports businessmen.
第10题
What is the oxidation state of iron in pyrites, FeS2？ Is the anion diatomic？ What physical measurements could be performed to test this hypothesis？
