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

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

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

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

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

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

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

To shut down a diesel engine after it exceeds the set maximum speed，which type of device listed should be used?（）

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

Using a file without a handle may result in （）