手三阳经的走向是（）
A.从胸走手
B.从手走头
C.从头走足
D.从足走腹
E.从手走胸
参考答案：B
什么是虚假水位？水位计假水位有几种？
A shipmate chokes suddenly，cannot speak，and starts to turn blue. You should（）.
A.perform the Heimlich maneuver
B.make the victim lie down with the feet elevated to get blood to the brain
C.immediately administer CPR
D.do nothing until the victim becomes unconscious
