单项选择题

（）are supplied by main switchboard directly.

A.Suez Canal searchlight, air compressor and air conditioning compressor
B.Air compressor, boiler blower and refrigeration plant
C.Boiler blower, Suez Canal searchlight and refrigeration plant
D.Suez canal searchlight, air compressor and boiler blower

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单项选择题

After resolving the trouble of main power supply, main switch of emergency generator should（）, if power supply is refreshed.

A.be switched off by the duty officer
B.be switched on by the duty officer
C.be switched off automatically
D.be switched on automatically

单项选择题

Emergency generator is installed on board mainly to （）

A.connect to the busbar when the load increasing
B.supply power specially to charging panel
C.be put into operation during the ship arriving at or leaving port
D.ensure the power supply to critical equipment after the main switchboard out of power

单项选择题

（）is not installed on the emergency switchboard.

A.Ammeter
B.Voltmeter
C.Wattmeter
D.Synchroscope