單項(xiàng)選擇題The （） engine is used for alternators and sometimes for main propulsion with a gearbox to provide a propeller of between 90 to 120 rpm.
A.four-stroke
B.two-stroke
C.slow speed
D.reversible
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1.單項(xiàng)選擇題As for turbine oil, contacting with water in the form of steam will be inevitable so good （） properties will be essential.
A.defrosting
B.de-oiling
C.demulsifying
D.dehumidifying
2.單項(xiàng)選擇題Precision engine bearing inserts are manufactured with a small portion of the bearing ends extending beyond the bearing housing or capsThe installation process of these bearings requires sufficient （）.
A.overlap
B.crush
C.lap or lead
D.protrusion
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