单项选择题
A.a safety harness with lifeline B.a safety net C.a life buoy D.buoyancy agarments
（）should generally best for handing acids,alkalis,vario...
单项选择题（）should generally best for handing acids,alkalis,various types of oils,solvents and chemicals in general.
A.Heat-resistant gloves B.Rubber gloves C.PVC gloves D.Leather gloves
（）should generally be used when handing rough or sharp ...
单项选择题（）should generally be used when handing rough or sharp objects.
A.Heat-resistant B.Rubber gloves C.PVC gloves D.Leather gloves
Long hair should always be covered by（）when working wit...
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
