（） is not installed on the main switchboar.

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

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

The shipboard oil pollution emergency plan will be invalid after （）

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

Using a file without a handle may result in （）

The Port State Control officer may witness a fire drill carried out by the crew assigned to these duties on the（）

During the diesel engine running, the water level of F.W expansion tank should normally kept in the （） level of glass tube.

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（）

Which of the following items don’t belong to dock repair works?（）