问题
单项选择题
When loading or discharging dry mud or cement，crew members should use goggles and（）.
A.facial respirator mask
B.ear plugs
C.rubberized boots
D.fireman's outfit
答案
参考答案：A
搜题请搜索小程序“爱下问搜题”
When loading or discharging dry mud or cement，crew members should use goggles and（）.
A.facial respirator mask
B.ear plugs
C.rubberized boots
D.fireman's outfit
参考答案：A