单项选择题
A.the forced ventilating system is operating
B.the cargo pumps are secured
C.no monocarbon gases are present
D.the oily water separator is de-energized
单项选择题 Personnel who are moving or handling material aboard ship should NOT follow which of the listed practices?（）
单项选择题 Prior to starting most medium-speed propulsion diesel engines, which of the procedures listed should be observed?（）
单项选择题 The order “（） ” means “Maximum maneuvering engine revolution for ahead propulsion”.