单项选择题
The outlet at a fire hydrant may be positioned anywhere from horizontal to pointing（）.
A.45°upward
B.vertically upward
C.vertically downward
D.all of the above
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A.all emergency signals
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Seeing that all hands are familiar with their duties，as specified in the muster list，is the responsibility of the（）.
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B.Chief Mate
C.safety officer
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