单项选择题
A.4.0 B.3.5 C.5.0 D.6.0
A.0.1MPa≤P≤0.2MPa B.0.2MPa<P≤0.4MPA C.0.4MPa D.0.8MPa<P≤1.6MPA
A.0.5 B.0.3 C.0.4 D.0.6
A.0.001 B.0.01 C.0.1 D.1.0
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