When loading or discharging dry mud or cem
题型:单项选择题
问题:
When loading or discharging dry mud or cement,crew members should use facial respirator masks and().
A.goggles
B.ear plugs
C.soft-soled boots
D.fireman's outfit
When loading or discharging dry mud or cement,crew members should use facial respirator masks and().
A.goggles
B.ear plugs
C.soft-soled boots
D.fireman's outfit