One of the signals，other than a distress signal，that can be used by a vessel to attract attention is a(n)（）.

A.headway
B.sternway
C.no way on，with engines stopped
D.no way on，with engines full ahead

A.very soft mud
B.rocky
C.a mixture of mud and clay
D.loose sand

A.hold a victim in a stretcher
B.stop uncontrolled bleeding
C.hold a large bandage in place
D.restrain a delirious victim