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【单选题】
“三无”食品是指（）。A.
无厂名厂址、无出厂合格证、无保质期的食品
B.
无厂名厂址、无配料表、无生产日期和保质期的食品
C.
无厂名厂址、无品名、无生产日期和保质期的食品
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【简答题】Look at the picture, the electrode, the arc and the weld pool are sorrounded by the shielding gas. They have no chance to contact with air before the molten metal cools down and solidifies. That`s to ...
【判断题】The welding consumables include filler metal, flux, backing material, shielding gas etc.
A.
正确
B.
错误
【单选题】A suitable shielding gas may isolate the following except ________ from air.
A.
welding gun
B.
hot electrode
C.
the arc
D.
the weld pool
【简答题】A．Avoiding B．Fending C．Escaping D．Shielding
【简答题】What should be specified about shielding gas in the WPS?
【简答题】A. Avoiding B. Fending C. Escaping D. Shielding
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