单项选择题
A towline should be fastened to（）.
A.the chocks at the bow of a towed vessel B.the most forward，centermost point of a towed vessel such asa sturdy bow rail C.the mast of a towed sailboat D.a secure fitting near the bow of the towed vessel
单项选择题 A shipmate chokes suddenly，cannot speak，and starts to turn blue. You should（）.
单项选择题 A right-handed propeller will cause the survival craft to（）.
单项选择题 A rescuer can most easily determine whether or not an adult victim has a pulse by checking the pulse at the（）.
