问题
选择题
Will you go and _____ the match with us?[ ]
A. see
B. watch
C. look
D. look at
答案
答案：B
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Will you go and _____ the match with us?[ ]
A. see
B. watch
C. look
D. look at
答案：B
。式中a0为一常量（玻尔半径）。试求原子电场强度大小的分布。