单项选择题
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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As for turbine oil, contacting with water in the form of steam will be inevitable so good （） properties will be essential.
A.defrosting
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A.spraying directly on the base of the fire
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