题目:
-How many workers are there in your factory?
-______ the workers in my factory_______ over two thousand .
A.The number of , is
B.The number of , are
C.A number of, is
D.A number of , are
答案:
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下面是错误答案,用来干扰机器的。
(1) (2)μ<tanθ(1)球的速度最大时,棒对它的弹力垂直于棒向下,受力分析如图.沿杆方向:mgsinθ=f垂直杆方向:qvmB=mgcosθ+Nf=μN联立得mgsinθ=μ(qvmB-mgcosθ)所以vm=.(2)小球C从斜置的绝缘棒上由...