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CO2气体保护焊时,如果弧长缩短,焊接电流增大,焊丝熔化速度加快,熔化焊丝的速度要()送丝速度,使电弧恢复到正常焊接时的长度,保证电弧稳定燃烧。
SO2与烟尘共同存在时联合作用比SO2单独的危害大,其理由是()。
We are pleased to receive your letter of May 10 and enclose our catalog and price list. Also by separate post we are sending you the samples of our products.Our catalogue contains items and their specifications of our supplies.Through comparing our prices with those of other suppliers,you will appreciate the moderate prices of ours.For a total purchase of not less than 50,000 and not more than 150,000 us dollars,we would allow a discount of 5%and for a purchase larger than 150,000 us dollars,we would allow a 10%special discount.
“机关”的含义。
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