单项选择题

What is a cofferdam ________．
A.Tube fitted to an ullage hole
B.Area the product is loaded into
C.Void or empty space separating two tanks
D.Opening in the deck used for cleaning a tank

A.A.Tube
B.Area
C.Void
D.Opening
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单项选择题
What type of stern tube bearing has the least friction ________．A.Oil-lubricated bearingsB.Lignum vitaeC.Hard rubberD.Bronze bushings
A.A.Oil-lubricated
B.Lignum
C.Hard
D.Bronze
判断题
共振腔消声器实质是共振吸声结构的一种应用。
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