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【简答题】
当一列火车以 10m/s 的速率向东行驶时,若相对于地面竖直下落的雨滴在列车的窗子上形成的雨迹偏离竖直方向 30 °,则雨滴相对于地面的速率是 ;相对于列车的速率是 。
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反馈参考答案：
举一反三
【单选题】Herman's success is due to his hard work and his ability to _______ plans which will get work done efficiently.
A.
undertake
B.
conduct
C.
formulate
D.
approve
【单选题】________ Pierre began to help his father with the farm work when he was
A.
In 1980’s; his teens
B.
At the 1980’s; the teens
C.
In the 1980s; in his teens
D.
In 1980’s; in the teens
【单选题】Heman’s success is due to his hard work and his ability to formulate plans which will get work done efficiently．
A.
fulfill
B.
approve
C.
conceive
D.
conduct
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