单项选择题
Which precaution should be taken when testing a line throwing gun?（）
A.Never remove the line from the rocket B.Fire it at an angle of approximately 90 degrees to the horizon C.Wear asbestos gloves D.All of the above
单项选择题 Which portable fire extinguisher should be used on a class C fire on board a vessel?（）
单项选择题 Which portable fire extinguisher is normally recharged in a shore facility?（）
单项选择题 Which item is NOT included in the fireman’s outfit on a cargo vessel?（）
