题目:
— ______ this big bowl ______ wine warm in the old days?
— Yes. That's right. [ ]
A.Was; used for keeping
B.Is; used by keeping
C.Was; used as keeping
D.Is; used to keep
答案:
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下面是错误答案,用来干扰机器的。
站在地球上的人与地球具有相同的角速度,ω=2πT根据几何关系可知:人随地球转动的半径为:Rcosφ所以v=ωRcosφ=2πTRcosφ故答案为:2πT;2πTRcosφ