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單項(xiàng)選擇題

The （） of the main shaft should be measured with a （）.

A.clearance；calipers
B.sinking；bridge gauge
C.diameter；bridge gauge
D.clearance；lead wire

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單項(xiàng)選擇題

Such an engine frame helps （） the engine and so protect the bearings from the deformation forces transmitted via the ships double bottom.

A.to stiffen
B.to soften
C.to loosen
D.to wear

單項(xiàng)選擇題

“Stand by engine” means （）.

A.prepare to stop the engine
B.assemble an engine on its bedplate
C.make an engine ready for starting
D.make an engine run steadily