问题
选择题
I like winter. I can _____________ snow.[ ]
A. play with
B. play on
C. playing in
答案
答案：A
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I like winter. I can _____________ snow.[ ]
A. play with
B. play on
C. playing in
答案：A
知，当两平行金属板带电量一定，板间距离越大板间场强越小