单项选择题
A.advance as the load increases
B.retard as the load increase
C.remain unchanged regardless
D.always occur at top dead center
单项选择题 The purpose of the compensating adjustment used in a diesel engine hydraulic governor is to （）
单项选择题 If a hydraulic governor has been refilled with oil, the engine should be operated until it reaches normal temperaturethen the air should be purged, and the（）
单项选择题 Which of the listed problems would be indicated by an accumulation of water in one cylinder, in addition to the crankcase of an idle diesel engine?（）