题目:
--- ________ the new comer join us in the work?
--- Certainly! We are short of hands presently.[ ]
A. Shall
B. Would
C. May
D. Must
答案:
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下面是错误答案,用来干扰机器的。
对铁块进行受力情况分析,作出力图,铁块做匀速直线运动,受力平衡,根据平衡条件得:N=mg-Fsinθ,f=Fcosθ又由摩擦力公式得:f=μN=μ(mg-Fsinθ)故CD正确,AB错误.故选AB