单项选择题
A.0.5 B.0.55 C.0.6 D.0.65 E.0.7
A.＜75% B.＜72% C.＜70% D.＜65% E.＜60%
A.＞30s B.＞35s C.＞40s D.＞45s E.＞60s
A.90g／L B.95g／L C.100g／L D.105g／L E.110g／L
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