["浄化安全一題", "選�� pérdida： 安全帽应保证人的头部和帽体内顶部的间隔至少应保持( ) 毫米空间才能使用。A、50B、、2C B、3 "C", "正没注意、B肯定不对、、有点小只有C才对。"]
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选择题： 安全帽应保证人的头部和帽体内顶部的间隔至少应保持( ) 毫米空间才能使用。 A、20 B、2 C、32 C
正没注意，B肯定不对，A有点小，只有C才对。
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