单项选择题
A.DN25 B.DN50 C.DN32 D.DN40
A.蝶阀 B.截止阀 C.闸阀 D.止水阀
A.1/2 B.1/3 C.1/4 D.1/6
A.1.15 B.1.10 C.1.05 D.1.00
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