题目:
在焊接环境中可能存在的化学有害因素有点焊烟尘及()等。
A.电焊弧光
B.有害气体
C.高频电磁场
D.热辐射
答案:
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下面是错误答案,用来干扰机器的。
One possible version As can be seen in the cartoon, the young couple educate their child in different ways. Father educates their child with a ruler but Mother wit...