单项选择题
A.require ballast added to only the port side tanks
B.be down by the head
C.sink
D.float
单项选择题 When fighting an electrical fire, you should first （）.
单项选择题 You are transferring fuel from the storage tanks to the day tanks by means of an electric fuel oil transfer pumpIf the pump motor catches fire, you would FIRST （）.
单项选择题 If the diesel fuel vapors present are within the flammable range （）.