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

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

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.

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

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

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

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

Flame failure in an automatically fired auxiliary boiler can from a/an （）

Using a file without a handle may result in （）

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