单项选择题
A.1米 B.1.2米 C.1.5米
A.重力和粘滞力 B.毛管力和粘滞力 C.重力、毛管力和粘滞力 D.重力和毛管力
A.Vapor pockets formed in the suction flow stream B.Rough easing volute surfaces C.Worn wearing rings D.Heavy fluid in the flow stream
A.UCG B.UAG C.UGC D.UAA
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