The piston crown employs the usual jet-shaker principle with an arrangement of cooling bores in the crown so that the surface temperatures of the crown are moderate with a very even distribution（）

A、water cooling

B、oil cooling

C、air cooling

D、combined cooling

Any carbon built up on surfaces must be washed away by （） additives and held in suspension by a （） additive.

A、dispersant；detergent

B、detergent；dispersant

C、dispersant；dispersant

D、detergent；detergent

Some diesel engines are fitted with a thermometer in the cooling water outlet from each cylinderIf the cooling water temperature from all cylinders begins to rise above normal, you should suspect （）

A、increase blow-by in all cylinders

B、incomplete combustion in all cylinder

C、overloading in all cylinders

D、insufficient fuel delivery to all cylinders

Moisture in a D-Cmotor would cause （）.

A、short circuit

B、speed up

C、slow down

D、hunting

If the PSCO has clear grounds for carrying out a more detailed inspection,（）

A、the master should be immediately informed

B、the master will be prohibited from contacting the Administration or other organization

C、he will carry out the inspection after the master be informed and be ready

D、he will carry out the inspection without informing the master

In the voyage, duty officer should inform （） situation to the duty engineer immediately.

A、in/ut port

B、passing through big bridge

C、big steering angle for direction changing

D、in/out port and passing through big bridge