问题
选择题
I like American movies ___ she likes Beijing Opera. [ ]
A. and
B. or
C. but
D. then
答案
答案：C
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I like American movies ___ she likes Beijing Opera. [ ]
A. and
B. or
C. but
D. then
答案：C
，通过导体横截面的电荷量为q，（其中P—t图像为抛物线）则这些量随时间变化的关系正确的是：