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【简答题】
有一人造地球卫星,质量为 m ,在地球表面上空 2 倍于地球半径 R 的高度沿圆轨道运行,用 m 、 R 、引力常数 G 和地球的质量 M 表示时 (1) 卫星的动能为 ____________ ; (2) 卫星的引力势能为 _____________ .
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【单选题】There is no doubt that we are living in a period of enormous population growth. In the past, it (51) thousands of years for the world's population to double in size. (52) today there are more people h...
A.
spent
B.
cost
C.
took
D.
consumed
【简答题】请写出 BOOL flag 与“零值”比较的 if 语句: 请写出 float x 与“零值”比较的 if 语句: 请写出 char *p 与“零值”比较的 if 语句:
【单选题】My hobby is _____ all kinds of coins. [ ]
A.
to collect
B.
collecting
C.
to pick up
D.
picking up
【单选题】There is no doubt that we are living in a period of enormous population growth. In the past, it(51)thousands of years for the world's population to double in size.(52)today there are more people havin...
A.
spent
B.
cost
C.
took
D.
consumed
【单选题】Living in a highly ___ society, you definitely have to arm yourself with as much knowledge as possible.
A.
favorable
B.
permanent
C.
tolerant
D.
competitive
【简答题】请写出if语句的几种形式?
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