单项选择题
Long hair should always be covered by（）when working with or near moving machinery.
A.a helment B.safety cap C.an ear plug D.face mask
单项选择题 Which of the following equipment is for protection against hypothermia?（）
单项选择题 Which of the following equipment is for protection against drowing?（）
单项选择题 Which of the following equipment is for body protection?（）
