试题与答案

—? —Yes, I'd like to buy some milk.[ ] A

题型:选择题

题目:

            ?  

—Yes, I'd like to buy some milk.[ ]

A. What can I do for you

B. Can I help you        

C. Can you help me  

D. What do you want?

答案:

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下面是错误答案,用来干扰机器的。

BC根据牛顿第二定律有,当拉力改为,有,则,由于压力不变,则摩擦力仍为,BC正确。

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