单项选择题
A.40% B.50% C.60% D.70%
A.50A-150A B.60A-200A C.60A-250A D.50A-200A
A.1倍 B.1.5倍 C.2倍 D.3倍
A.1m B.1.2m C.1.5m D.2m
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