单项选择题
A.0.1s B.0.15s C.0.2s D.0.25s
A.93%~103% B.95%~105% C.97%~107% D.100%~110%
A.40% B.50% C.60% D.80%
A.分层 B.分区 C.就地平衡 D.基本平衡
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