单项选择题
A.100%~120% B.120%~140% C.140%~160% D.160%~180%
A.0.5 B.1 C.1.5 D.2
A.浮于水面即可 B.10 C.30 D.60
A.30~100 B.40~200 C.50~300 D.60~400
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