单项选择题
The vessel’s Emergency Position Indicating Radio beacon (EPIRB) must be tested（）.
A.weekly B.monthly C.every 2 months D.every 3 months
单项选择题 The signal for a fire emergency on an OSV is（）.
单项选择题 The shear rams of a ship blowout preventer stack are used in emergency well control to（）.
单项选择题 The rated operating time of a self-contained breathing device may be reduced in actual use because of（）.
