A.Oxygen deficient spacesB.Compartments containing pois……

单项选择题The rescuer can best provide an airtight seal during mouth-to-mouth resuscitation by pinching the victim’s nostrils and（）.

A.Cupping a hand around the patient's mouth
B.Keeping the head elevated
C.Applying his mouth tightly over the victim's mouth
D.Holding the jaw down firmly

单项选择题The key to rescuing a man overboard is（）.

A.Good communication
B.A dedicated crew
C.Good equipment
D.Well-conducted drills

单项选择题The indication of a slipping anchor is a（n）（）.

A.Decrease in mooring line length
B.Increase in the opposite amperage
C.Increase in the opposite line tension
D.Decrease in mooring line tension and amperage

单项选择题The Coordinator Surface Search（CSS）in a SAR situation should display by night（）.

A.Deck lights forward and aft
B.A white light over two red lights
C.A red light，white light，and blue light in a vertical line
D.A distinctive signal promulgated by the CSS

单项选择题Stop search and return to（）.

A.keel
B.virgin
C.origin
D.base