问题
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
答案
参考答案：B
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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
参考答案：B