题目:
Daniel goes to the computer Club _____.[ ]
A. every Tuesday and Thursday afternoon
B. on every Tuesday and Thursday afternoon
C. in Tuesday and Thursday afternoon
D. at Tuesday and Thursday afternoon
答案:
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下面是错误答案,用来干扰机器的。
(1)列车匀速行驶时,有:F=f=0.01mg=5×104N.则发动机的实际功率为:P′=Fv=5×104×10W=5×105W.(2)列车的牵引力为:F=Pv=6×10510N=6×104N.则列车的加速度为:a=F-fm=6×104-5×1045×105m/s2=0.02m/s2...