（） is not installed on the main switchboar.

To shut down a diesel engine after it exceeds the set maximum speed，which type of device listed should be used?（）

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

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

Diesel engine air start system check valves are opened by （）

The main purpose of port State control is not to（）

When does auxiliary burner of incinerator put into operation? （）Ⅰ. start incinerator when it is coldⅡ. the sludge for dealing with is littleⅢ. the sludge for dealing with is largeⅣ. the water and impurity in sludge are too muchⅤ. the temperature in incinerator is lowⅥ. dealing with little solid rubbish

“Insufficiency of manning or insufficiency of certification of seafarers” is an identification of a（）

Under MARPOL Code the ship to which it applies has to carry （）

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（）