单项选择题
A.fireman's outfit
B.low-velocity spray applicator
C.marine strainer
D.pick axe
单项选择题 Each fire hydrant must have at least one spanner and at least one（）.
单项选择题 Each fire hose coupling on a ship must have threads that meet the specifications of the（）.
单项选择题 During the required periodic abandon ship drill aboard a ship，each person not assigned duties in the muster list is（）.