Which of the following beneficial results can be expected from supercharging a previously naturally aspirated engine?（）

A、Increased turbulence

B、increased mechanical efficiency

C、Increased brake mean effective pressure

D、All of the above

An ohmmeter can be used to measure（）

A、current flow in a circuit

B、voltage between two points in a circuit

C、circuit continuity

D、power

A fire is considered "under control" when （）.

A、all hands are at their fire stations

B、all fire-fighting equipment is at the scene

C、the fixed systems are activated

D、the fire is contained and no longer spreading

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

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

The bore of a diesel engine cylinder describes the （）

A、swept volume of the cylinder

B、inside diameter of the cylinder

C、piston displacement in the cylinder

D、length of the piston stroke