问题
选择题
13._________his size, I guessed that he was a basketball player. 
A．To judge from
B．Having judged by
C．Judging from
D．Judged by
答案
答案：C
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13._________his size, I guessed that he was a basketball player.
A．To judge from
B．Having judged by
C．Judging from
D．Judged by
答案：C
和
，已知
，OP距离为2L，则场强为零的坐标x区间为[ ]