单项选择题
A.0.13~0.40 B.2.7~4.0 C.6.5~7.4 D.7.5~9.0
A.0.1%~0.3% B.0.3%~0.5% C.0.5%~0.8% D.0.5%~1%
A.截止阀 B.止回阀 C.背压阀 D.电磁阀
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