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

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

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

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

Using a file without a handle may result in （）

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

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

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?（）

Which one is NOT the ‘clear grounds’ for a more detailed inspection?（）