单项选择题
A.5mm B.5μm C.1mm D.1μm
A.指示 B.报警 C.切断被控电源 D.指示、报警、切断被控电源
A.绝对静压 B.相对静压 C.位压 D.动压
A.1% B.0.5% C.0.24% D.0.0024%
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