单项选择题
A foam-type portable fire extinguisher would be most useful in combating a fire in（）.
A.soild materials such as wood or bales of fiber B.flammable liquids C.a piece of electrical equipment D.combustible metallic solids
单项选择题 A galley grease fire on the stove may be extinguished using（）.
单项选择题 A gypsy or gypsyhead is a（）.
单项选择题 A hydrostatic release mechanism for a liferaft（）.
