A fully loaded motor-propelled lifeboat must be capable of attaining a speed of at least（）.

A.be the first individual to board the craft
B.drain the hydraulic pressure before lowering the craft
C.have a list of the persons assigned to the lifeboat
D.All of the above

A.lift oars to vertical position，trim blades fore and aft with handles resting on the thwarts
B.complete the stroke，come to Oars，raise the oars smartly to the vertical，rest handles on footings and trim blades fore and aft
C.place oars in row locks directly from the boated position or from Stand by oars position
D.complete the stroke (when rowing in ahead motion)，raise the oars with crook of elbow to about 30 degrees，swing blades forward

A.Cut the painter line so it will not pull the liferaft container down
B.Swim away from the container so you will not be in danger as it goes down
C.Take no action because the painter will cause the liferaft to inflate and open the container
D.Manually open the container and inflate the liferaft with the hand pump