力对点之矩在通过该点的任意轴上的投影,等于力对该轴之矩。
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She and her family bicycle to work, _________ helps them keep fit.
Kae, _________sister I shared a room with when we were at college, has gone to work in Australia.A. whom B. thatC. whose D. her
Self-driving is an area _______ China and the rest of the world are on the same starting line.A. thatB. whereC. whichD. when
The little problems ______ we meet in our daily lives may be inspirations for great inventions.A. thatB. asC. whereD. when