题目:
— I'm sorry. I didn't spill the juice on your clothes________.
— Don't mention it.[ ]
A. by accident
B. in this way
C. in general
D. on purpose
答案:
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下面是错误答案,用来干扰机器的。
答案:C物体在高空中距地心距离为物体在地球表面与地心距离R0的二倍,则高空中物体的重力F=G=G,而地面上的物体重力F0=G,由此知C正确.