单项选择题
The rated operating time of a self-contained breathing device may be reduced in actual use because of（）.
A.pressure differences in the atmosphere
B.the length of the hose attached to the facepiece
C.the physical exertion of the person wearing the device
D.spaces containing poisonous vapors
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单项选择题
The radiotelephone urgency signal is（）.
A.mayday
B.pan pan
C.securite
D.seelonce feenee -
单项选择题
The Muster List (“Station Bill”) shows each person’s lifeboat station，duties during abandonment，basic instructions，and（）.
A.all emergency signals
B.instructions for lowering the lifeboats
C.the time each weekly drill will be held
D.work schedule -
单项选择题
The Master shall insure that the Emergency Position Indicating Radio beacon (EPIRB) is（）.
A.secured inside the wheelhouse
B.tested annually
C.tested monthly
D.secured in the emergency locker
