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

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

（） is not installed on the main switchboar.

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

For a given exhaust gas boiler, what is the quantity of its evaporation mainly determined?（）

If two A.C.generators are to be operated in parallel, the load is distributed evenly by（）

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

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

As soon as a diesel engine has started, which of the listed engine operating parameters should be checked FIRST?（）

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