问题
单项选择题
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
答案
参考答案：A
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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
参考答案：A
