单项选择题
A.直径不小于5cm B.直径不小于8cm C.直径不小于12cm D.直径不小于20cm E.直径不小于10cm
A.160s B.200s C.120s D.240s E.100s
A.2.5％ B.0.5% C.7.5% D.10% E.2%
A.20~40滴 B.40~60滴 C.60~80滴 D.80~100滴 E.50~60滴
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