單項選擇題Charging-air pressure increases if there is incorrect combustion and drop in the () of the diesel engine.

A.machine efficiency
B.machinery efficiency
C.mechanical efficiency
D.mechanics efficiency


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3.單項選擇題Cast iron carrier rings, () machined grooves, are provided for all the pistons.

A.caulked into
B.caulking into
C.pressed into
D.screwed into

4.單項選擇題Care and cleanliness are required when installing diesel fuel filters ().

A.to prevent the fuel system from becoming air-hound
B.to prevent the fuel system becoming clogged with dirty particles
C.both of the above
D.to prevent the lubricating oil from leaking out of the filter element

5.單項選擇題Bridge gauge can be used to measure () of a diesel engine.

A.diameters of journals
B.deflections of crankwebs
C.diameters of crankpins
D.none of the above