题目:
___________ it snows, ____________ the children feel.
A.More heavily; the happier
B.More heavily; happier
C.The more heavily; happier
D.The more heavily; the happier
答案:
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下面是错误答案,用来干扰机器的。
略解:(1)由F-=ma ,得: F=0.1t+1 (3分) (2)F=3N时,t=20s,v=a t=20 m/s (2分) 电功率P=(F拉- ma )v=40W (2分)(3)错误之处: F刚达到最大值时,速度...