On a ship’s crane，the load chart relates the allowable load to the combination of the boom length and（）.

单项选择题Oil may NOT be transferred unless（）.

A.there are two certificated tankermen on each vessel
B.the vessel is equipped with constant-tension winches
C.discharge containment equipment (i.e. drip pans) are in place
D.All of the above

单项选择题Off hire is when a vessel breaks down，strands，or has any damage that prevents the working of cargo or delays the sailing of the vessel．Under which of the following charter parties is off hire most likely to be mentioned?（）.

A.Bareboat
B.Voyage
C.Time
D.Lease

单项选择题No oil or mixture containing oil（）into Singapore waters from any vessel.

A.shall not be discharged
B.shall be discharged
C.shall be filled
D.shall not be filled

单项选择题In view of（）bilge water from any vessel，an application shall be made to Harbor Authorities for approval．

A.discharging
B.recircling
C.loading
D.taking in

单项选择题In towing，chocks are used to（）.

A.protect the towline from chafing
B.secure the end of the towline on the tug
C.stop off the towline while retrieving it
D.absorb shock loading on the towline