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

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

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

（） is not installed on the main switchboar.

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

The additional mark （）in the Classification Certificate for Machinery means propulsion apparatus is remotely controlled on the navigating bridge control station, and engine assembly control station is unmanned periodically.

Using a file without a handle may result in （）

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

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

To proceed to the assistance of a ship in distress is（）