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單項(xiàng)選擇題

A device fitted over the discharge opening on a relief valve consisting of one or two woven wire fabrics is called a flame（）.

A.stopper
B.screen
C.filter
D.restrictor

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單項(xiàng)選擇題

A decrease in barometric pressure is associated with all of the following except（）.

A.rising warm air
B.proximity to a low pressure area
C.inward spiraling circulation
D.clear dry weather

單項(xiàng)選擇題

（）during the voyage any case or suspected case of plague，cholera，yellow fever，smallpox，typhus or relapsing fever?

A.Has there been
B.Have there been
C.Has there
D.Have there

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