单选题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 rudderB one engine ahead and one engine astern，with rudders amidshipsC both engines ahead，

---Dead slow ahead! ----Dead slow ahead! _______________

A.Engine dead slow ahead!

B.Engine dead ahead slow!

C.Engine slow dead ahead!

D.I do it right now

---Slow ahead both engines! ---Slow ahead both engines! ___________________!

A.Both engines slow ahead

B.Engine slow ahead port

C.Engine slow ahead starboard

D.Engine both ahead

You may BEST turn a twin-screw vessel about，to the right，in a narrow channel by using ______.

A.Both engines ahead and helm

B.One engine only

C.Port engine ahead and the starboard engine astern

D.Both engines astern and use helm

When turning a ship in restricted space with a strong wind，it is normally best to ______．

A.Go ahead on both engines with the rudder hard to one side，if on a twin-screw vessel

B.Back down with the rudder hard to one side，if on a single-screw vessel

C.Take advantage of the tendency to back to port，if on a twin-screw vessel

D.Turn so that the tendency to back into the wind can be used，if on a single-screw vessel

The order“______” means “Maximum maneuvering engine revolution for ahead propulsion.”

A.Full Ahead

B.Half Ahead

C.Full Astern

D.Half Astern

---Slow ahead! ---Slow ahead! _______________!

A.Engine ahead slow!

B.Engine slow ahead!

C.Ahead engine slow!

D.Yes, sir

Before "stand by" is rung on the engine telegraph, it is usual to give the main diesel engine a brief trial ahead and astern.

A.with power

B.on power

C.with air

D.on air

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

Please tell me ______ to reverse your engine from full ahead to full astern．

A.How length will it take

B.How long it will take

C.How long will it get

D.How much hours it will take

On a vessel with a single propeller，transverse force has the most effect on the vessel when the engine is put ______．

A.full ahead

B.full astern

C.half ahead

D.slow astern