单项选择题
Which of the following equipment is for protection against drowing?（）
A.Safety helmets B.Buoyance aids C.Breathing apparatus D.Immersion suits
单项选择题 Which of the following equipment is for body protection?（）
单项选择题 Which of the following equipment is for hand and foot protection?（）
单项选择题 Which of the following equipment is for respiratory protection?（）
