问题
选择题
He hasn't slept at all for three days. _____ he is tired out. [ ]
A. There is no point
B. There is no need
C. It is no wonder
D. It is no way
答案
答案：C
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He hasn't slept at all for three days. _____ he is tired out. [ ]
A. There is no point
B. There is no need
C. It is no wonder
D. It is no way
答案：C
是多少？若接成三线制（即星形连接不用中线）A相断路时，线电流IB、IC是多少？