问题
选择题
We can’t wait. We have to_________ the direction and the distance before we take action.
A．let out
B．figure out
C．try out
D．turn out
答案
答案：B
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We can’t wait. We have to_________ the direction and the distance before we take action.
A．let out
B．figure out
C．try out
D．turn out
答案：B
衰变后产生的新核的中子数比
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