单项选择题
A.50000B.20000C.10000D.5000
A.0.0001B.0.001C.0.01D.0.1
A.1.1倍历时6hB.1.2倍历时6hC.1.1倍历时4hD.1.2倍历时4h
A.0.6B.0.7C.0.5D.0.4
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