单项选择题
A.when the engine RPM is pulled down by overload
B.at rated engine RPM
C.at 95 % of rated engine RPM
D.at 95 % of a properly adjusted governor RPM with the engine under full load
单项选择题 Engine protection by means of an alarm or shutdown control can be obtained with devices that are sensitive to （）.
单项选择题 In diesel engines, the four basic events (intake, compression, power and exhaust) are performed once in （）.
单项选择题 If the main engine of an unattended engine room shuts down automatically, it will be indicated by an alarm （）.