题目内容

预热区在焊道两侧，每侧宽度均应大于焊件厚度的（）倍以上，且不应小于（）mm。

A. 1.2，80
B. 1.5，80
C. 1.5，100
D. 1.2，100

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（）is not an advice be observed when samples are taken in tanks containing volatile petroleum products.

A. Filter masks with a combination filter should be brought and used whenever necessary
B. Only explosion-proof equipment（marked EEx）should be used
C. Avoid breathing petroleum gases，especially if they come from sour crude（smell of rotten eggs）
D. so far as possible，take early and substantial action to keep well clear

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