單項選擇題To develop maximum anchor holding power,the optimum angle between the anchor’s shank and the mooring lines is().

A.0 degrees
B.10 degrees
C.20 degrees
D.30 degrees


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2.單項選擇題There is plenty of()at this area.

A.a room
B.room
C.rooms
D.the room

3.單項選擇題There is not()depth of water around the area centered at the lighthouse.

A.ample
B.sufficient
C.enormous
D.incredible

4.單項選擇題The vessel was drifted off from her()due to strong wind.

A.course
B.track
C.direction
D.trend

5.單項選擇題The use of the danger signal().

A.replaces directional signals
B.makes the other vessel the stand-on vessel
C.indicates doubt as to another vessels actions
D.is the same as a MAYDAY signal