During the diesel engine running, the water level of F.W expansion tank should normally kept in the （） level of glass tube.

The shipboard oil pollution emergency plan will be invalid after （）

A purge recovery system is used in a centrifugal air conditioning or refrigeration system to （）

（） is not installed on the main switchboar.

By comparing the exhaust gas temperature of each cylinder, the operator can determine if the load is balanced throughout the engine. The device most commonly used is a（）

Cold weather starting of a diesel engine may be made easier by（）

Flame failure in an automatically fired auxiliary boiler can from a/an （）

One of the reasons that cause oil flowed from sludge outlet of a self-cleaning separator is（）

The flash point of a residual fuel oil should be used to determine the highest temperature to which oil may be heated（）

The treatment of the fuel oils involves storage, heating, filtering and（）