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

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

Which of the listed governor characteristics will greatly affect the load sharing relationship between paralleled diesel generators?（）

Engine parameters shall be corresponded to NOx Technical Files. This is required by （）

Which of the diesel engine components listed increase air density and helps to improve engine operating efficiency?（）

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

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

The condensers located in various stages of a flash evaporator are cooled by（）

Thermostatic steam pressure reducing valves are used in the fuel oil service system to control the（）

（）connectors hold best if a wire is accidentally pulled or a connection becomes loose.