（）does it take to change the main engine from ahead to aster

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

A.Engine ahead slow!

B.Engine slow ahead!

C.Ahead engine slow!

D.Yes, sir

In the navigation,_______cause the shafting over load most easily

A.stopping the main engine suddenly

B.changing the main engine running direction suddenly

C.the sailing from the shallow water area to the deep water area

D.the ship's trim too much

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

If anything abnormal be found on the load change of main engine when the ship is entering in shallow waterway, before taking measures the engineer on duty should _______.

A.stop main engine immediately

B.ask the captain and the chief engineer's permission for stopping the engine

C.inquire the bridge for the situation initiatively

D.stop engine and inform bridge

---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

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

---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

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