The economics of removing sulfur form the higher sulfur coals appears less encouraging than removing sulfur oxides form the gaseous products of combustion
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1.using a cotton tipped cleaning stick that has been submerged in liquid nitrogen, seed the bottom column of the straw away from bottom air column and immediately place into freezing unit. 2. wait one minute before bringing up straw to seed top column 帮忙翻译一下，谢谢！！！
