單項(xiàng)選擇題On a twin-screw，twin-rudder vessel，the most effective way to turn in your own water，with no way on，is to put（）.

A.one engine ahead and one engine astern，with full rudder
B.one engine ahead and one engine astern，with rudders amidships
C.both engines ahead，with full rudder
D.both engines astern，with full rudder


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1.單項(xiàng)選擇題On a single-screw vessel the stern frame（）.

A.furnishes support to the rudder，propeller shaft，and transom frame
B.provides foundations for after mooring winches
C.provides foundations for the main propulsion engines
D.transfers the driving force of the propeller to the hull

2.單項(xiàng)選擇題On a ship，the possibility of a blowout makes which type of diesel engine shutdown desirable?（）

A.Overspeed trip
B.Air inlet shut-off valve
C.Water injector
D.Fuel cutoff valve

3.單項(xiàng)選擇題My ship’s engine responds well to telegraph orders and takes about 80 seconds to reverse from full speed ahead to full speed astern.This sentence（）.

A.indicates the engine's particulars
B.tells the engine's function
C.shows the engine's type
D.refers to the engine's information

4.單項(xiàng)選擇題Most medium and slow speed diesels are started by what medium?（）

A.Electric starting motors
B.Hydraulics
C.Compressed air
D.Ether

5.單項(xiàng)選擇題Many sheath-screw davits have markings to indicate the maximum angle to which they should be cranked out. If the angle is exceeded，the davit（）.

A.may jam against the stops
B.will not automatically position the boat at the embarkation station
C.screw may come out of the sheath
D.will chafe against the falls and may cause their failure