The cetane rating of diesel fuel is an indication of the （）

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

Using a file without a handle may result in （）

The shipboard oil pollution emergency plan will be invalid after （）

A purge recovery system is used in a centrifugal air conditioning or refrigeration system to （）

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

Cold weather starting of a diesel engine may be made easier by（）

Thermostatic steam pressure reducing valves are used in the fuel oil service system to control the（）

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 Port State Control officer may witness a fire drill carried out by the crew assigned to these duties on the（）