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【简答题】
每个行星系都有各自的开普勒恒量 k ,如果月球轨道半径是 3.83 × 10 8 m ,周期是 27.3 天,则地球的 k 值为 。
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【单选题】The army officer _______ his men to fire the moment the enemy appeared.
A.
commanded
B.
had
C.
let
D.
made
【简答题】把影响某一装配精度的有关尺寸彼此按顺序地连接起来构成一个封闭外形,这些相关尺寸就是( )。
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