The essential part of the diesel engine, whose function is to convert the heat energy into the mechanical power, is the （）.

Among the main propulsion units on board the ship with ...

单项选择题Among the main propulsion units on board the ship with the same capacity, the lightest one is（）.

The rotating range of the low speed diesel engine is us...

单项选择题The rotating range of the low speed diesel engine is usually lower than （）.

Before using or operating any equipment, you should fir...

单项选择题Before using or operating any equipment, you should first （） its manual thoroughly and understand its contents（）.