单项选择题
A.3 B.6 C.8
A.3~5 B.5~15 C.15~25
A.IZ≥IQe+∑KXIe B.IZ=∑Ie C.IZ≤IQe+∑KXIe
A.1.8~2.5 B.4~7 C.8~10
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