A vessel is equipped with twin propellers，both turning outboard with the engines half ahead.If there is no wind or current and the rudders are amidships，what will happen?A.The bow will swing to starboardB.The bow will swing to portC.The vessel will steer

A head on situation shall be deemed to exist at night when a power-driven vessel sees another power-driven vessel ahead and ______.

A.one sidelight and the masthead light are visible

B.the vessels will pass closer than half a mile

C.both vessels sound one prolonged blast

D.both sidelights and masthead light(s) are visible

A twin-screw vessel with a single rudder is making headway. The engines are full speed ahead.There is no wind or current. Which statement is FALSE?

A.If one screw is stopped，the ship will turn toward the side of the stopped screw

B..The principal force which turns the ship is set up by the wake against the forward side of the rudder

C.Turning response by use of the rudder only is greater than on a single-screw vessel

D.With the rudder amidships，the ship will steer a fairly steady course

When one upbound vessel is overtaking another vessel and both are pushing a tow ahead，what reaction may you expect ________．

A.Both towheads will tend to drift apart，and the overtaking vessel will be slowed down

B.Both towheads will tend to drift together，and the overtaking vessel will be slowed down

C.Both towheads will tend to drift apart，and the overtaken vessel will be slowed down

D.Both towheads will tend to drift together，and the overtaken vessel will be slowed down

A twin screw vessel, making headway with both engines turning ahead, will turn more readily to starboard if you ______.

A.reverse port engine, apply right rudder

B.reverse port engine, rudder amidships

C.reverse starboard engine, apply right rudder

D.reverse starboard engine, rudder amidships

When backing down with sternway，the pivot point of a vessel is ______.

A.about one-quarter of the vessel's length from the stern

B.at the bow

C.about one-third of the vessel's length from the bow

D.aft of the propellers

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

材料：

With the engines on stand-by，orders were given to cut the remaining forward lines at 0755 hours，the starboard engine was put on“slow astern”and the helm to“hard a starboard”． When the forward lines were cut，the bow was blown off and swung away from the quay under the influence of the wind and，combined with the effect of the engine going astern on the after spring，canted the bow to port，until a heading of North was reached with the vessel&39;s stern approximately 15 meters off the dock face．

The engines were put to half astern at 0810 hours and with the bow continuing to swing to port，the after back-spring parted with the stern about 20 meters clear of the wharf．Orders were given to cut the remaining 5 stern lines．This was accomplished by 0818 hours，at which time the end of the pier was abeam of the bridge and the vessel was heading in a NW-ly direction． Both engines were placed to full astern with the shaft turning 80-90 revolutions．As the UNISOL was unable to gain sternway and with high seas at the end of the breakwater，the Pilot feared that the vessel&39;s starboard quarter was in danger of striking the breakwater．

Hence the engines were stopped at 0827 hours，and orders were given to“let go port anchor to 2 shackles in the water”，but about 4 shackles ran out before the brake could be fully applieD、At 0828 hours，orders were given to shorten up on the anchor cable，the telegraph put on full ahead and the helm to hard to port． When the engines responded at 0829 hours，the anchor chain was seen to be stretched out on the port beam with a great deal of weight on it and the ship&39;s head was 220° gyro with the vessel swinging to port．

The anchor was hove short to 2 shackles in the water by 0835 hours，and the vessel continued to drift westwards with 80-90（full ahead）revolutions on the engine．At this stage，orders were given to pay out the cable，which was paid out to 5 shackles in the water by 0838 hours，but that too failed to arrest the westward drift of the vessel．

问题：

The wind was probably blowing from ________．

A.West

B.East

C.North

D.South

The vessel had ________．A.one engine

B.two engines

C.three engines

D.four engines

According to the passage，________．A.the bow of the vessel parted the pier first

B.the stern of the vessel parted the pier first

C.the beam of the vessel parted the pier first

D.it can not be concluded which part of the vessel parted the pier first

It can be concluded that ________．A.the vessel was lying portside along the pier

B.the vessel was lying starboardside along the pier

C.the vessel was lying at a buoy

D.the vessel was anchored

请帮忙给出每个问题的正确答案和分析，谢谢！

In a twin screw ship going half-ahead,both screws turning outboard and the rudder amidships no current or wind, the vessel will ______.

A.Move bodily to port

B.Move bodily to starboard

C.Move in a zig-zag motion

D.Steer a fairly straight course