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.

The treatment of the fuel oils involves storage, heating, filtering and（）

The condensers located in various stages of a flash evaporator are cooled by（）

（）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?（）

（） is not installed on the main switchboar.

If separating effect is not good, which measure should be taken （）

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

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 （）