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- A.They are effective on most vessels at speeds up to 10 knots
- B.Because of their location，most modern installations have as much power as a tug
- C.They are fully effective at all drafts
- D.When going astern at slow speed，they provide effective steering control
- A.Sheath-screw boom
- B.Radial
- C.Crescent
- D.Quadrantal
- A.Quadrantal
- B.Gravity
- C.Sheath-screw
- D.Radial
- A.Centrifugal pump
- B.Reciprocating pump
- C.Rotary pump
- D.All of the above
- A.The pumps go to full stroke
- B.The six-way valve aligns itself with the running pump
- C.Both port and starboard cables are energized
- D.The synchronous receiver turns，duplicating the helm motion
- A.Dunnage or other suitable material
- B.other strongbacks
- C.hatch covers
- D.other pontoons
- A.Late fuel injection
- B.Excess combustion air
- C.Dribbling injector tips
- D.Excessive lube oil consumption
- A.Shaft seal
- B.Water flinger
- C.Drain hole
- D.Lantern ring
- A.Volatility
- B.Viscosity
- C.Flash point
- D.Specific heat
- A.Air pressure
- B.Hydraulic pressure
- C.Electric current
- D.Mechanical force
