单项选择题
A.≥12H B.≥8H C.≥6H D.≥4H
A.≥48H B.≥24H C.≥12H D.≥8H
A.150-160 B.150-170 C.150-1810 D.150-200
A.20%~30% B.30%~40% C.40%~50% D.50%~70%
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