单项选择题
A.10000 B.13000 C.15000 D.18000
A.1000 B.1800 C.2200 D.2400
A.0.5m-1 B.1.0m-1 C.2.0m-1 D.2.5m-1
A.0.5% B.0.8% C.1.0% D.1.2%
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