单项选择题
A connecting rod in a four-stroke/cycle diesel engine is subject to（）
A.tension load twice each crankshaft revolution B.compression load during power and compression strokes C.inertia load once every four crankshaft revolutions D.bending loads at bottom and top dead center
单项选择题 Thermocouple pyrometers are used on large, main propulsion diesel engines to indicate the temperature of the（）
单项选择题 Low compression pressure in a diesel engine is caused by（）
单项选择题 A pyrometer is an instrument used to measure the temperature of the diesel engine（）
