问题
选择题
— You ____ me such a bad quality coat. Obviously, you are cheating me.
— So what? No one forced you to buy it. [ ]
A. are selling
B. sold
C. have sold
D. had sold
答案
答案：B
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— You ____ me such a bad quality coat. Obviously, you are cheating me.
— So what? No one forced you to buy it. [ ]
A. are selling
B. sold
C. have sold
D. had sold
答案：B
=5×104C/kg，不计粒子的重力。求：