单项选择题
A.minimum oxygen content line B.critical displacement line C.critical dilution line D.upper threshold limit
If，during helicopter refueling operations，fuel is spill...
单项选择题If，during helicopter refueling operations，fuel is spilled on clothing，the person should first（）.
A.see the medic immediately B.spray himself with foam or CO2 C.complete his task and then see the medic D.remove the clothing and wash
Each part of the fire-main system located on an exposed...
单项选择题Each part of the fire-main system located on an exposed deck must be（）.
A.protected against freezing B.locked to prevent theft C.numbered sequentially D.pressurized at all times
Each hose in the fuel transfer system for helicopter re...
单项选择题Each hose in the fuel transfer system for helicopter refueling must meet the standards of the（）.
A.Federal Aviation Administration B.Corps of Engineers C.National Fire Protection Association D.National Transportation Safety Board
