单项选择题
A.a distinctive signal B.the Morse Code signal for SOS C.a computerized voice announcement of Mayday D.your vessel's International Radio Call Sign
What is the primary purpose of a splint applied in firs...
单项选择题What is the primary purpose of a splint applied in first aid?（）
A.Control bleeding B.Reduce pain C.Immobilize a fracture D.Reset the bone
What is the normal length of anchor cable used to ancho...
单项选择题What is the normal length of anchor cable used to anchor a vessel?（）
A.An amount equal to the depth of the water B.Two times the depth of water C.Three to four times the depth of water D.Five to seven times the depth of water
What is the MOST irritating to the skin?（）A.Carbon disu...
单项选择题What is the MOST irritating to the skin?（）
A.Carbon disulfide B.Ethyl alcohol C.Isoprene D.Oleum
