单项选择题
A.17.9t/dB.24.43t/dC.28.4t/dD.35.10t/d
A.3/4B.1/2C.2/3D.1/3
A.30,120B.20,130C.10,120D.30,130
A.电磁阀B.遥控阀C.拨料阀D.排焦阀
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