单项选择题
A.overloading in all cylinders
B.a jammed three-way thermostatic valve
C.chromate PH too low
D.a high level in the surge tank
单项选择题 Trunk-type diesel engine pistons are most effectively cooled by heat（）
单项选择题 As soon as a diesel engine has started, which of the listed engine operating parameters should be checked FIRST?（）
单项选择题 The connecting rod is fitted between the crosshead and the crankshaftI t transmits the firing force, and together with the crankshaft converts the （）motion to a （）motion.