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

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

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

（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.

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（）

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

If separating effect is not good, which measure should be taken （）

The ISPS Code consists of a mandatory section-Part A, which shows（）

Refrigerant entering the compressor of a refrigeration system should be in which of the following conditions?（）

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