单项选择题

A．The rocket should be inexpensive to construct.
B．The rocket is capable of lifting heavy spacecraft into orbit.
C．The rocket should be easily controlled.
D．The rocket should be inexpensive to operat
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单项选择题
A．Unemployment.B．Family breakup.C．Mental problems.D．Drinkin
A．Unemployment.
B．Family breakup.
C．Mental problems.
D．Drinkin
单项选择题
A．Neither of the two types of rockets is very economical.B．The liquid-fuel rocket is best.C．Each type of rocket has certain advantages.D．The solid-fuel rocket is best.
A．Neither of the two types of rockets is very economical.
B．The liquid-fuel rocket is best.
C．Each type of rocket has certain advantages.
D．The solid-fuel rocket is best.
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