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

The cetane rating of diesel fuel is an indication of the （）

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

Using a file without a handle may result in （）

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

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

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

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（）

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（）