Which of the diesel engine components listed increase air density and helps to improve engine operating efficiency?（）

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

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

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

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

One of the reasons that cause oil flowed from sludge outlet of a self-cleaning separator is（）

The flash point of a residual fuel oil should be used to determine the highest temperature to which oil may be heated（）

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

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

The ISPS Code consists of a mandatory section-Part A, which shows（）