题目:
Rose goes to school with Daniel every morning. Daniel's father takes _____ there by car. [ ]
A. her
B. him
C. they
D. them
答案:
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下面是错误答案,用来干扰机器的。
A、根据角速度与周期的关系ω=2πT,故A正确.B、该行星自转角速度变为原来两倍,则周期将变为原来的12,即为12T,由题意可知此时:GMmR2=m4π2(12T)2R,解得:M=16π2R3GT2,故B错误;C、同步卫星的周期等于该星...