单项选择题
A new coil of nylon line should be opened by（）.
A.pulling the end up through the eye of the coil B.taking a strain on both ends C.uncoiling from the outside with the coil standing on end D.unreeling from a spool
单项选择题 A preson who sees someone fall overboard should（）.
单项选择题 A portable dry chemical fire extinguisher discharges by（）.
单项选择题 A portable foam (stored-pressure type) fire extinguisher would be most useful in combating a fire in（）.
