单项选择题
A.45°upward
B.vertically upward
C.vertically downward
D.all of the above
单项选择题 The muster list shows each rig hand’s muster station，his duties during abandonment，basic instructions，and（）.
单项选择题 Small oil spills on deck can be kept from going overboard by（）.
单项选择题 Seeing that all hands are familiar with their duties，as specified in the muster list，is the responsibility of the（）.