The standard requires that all samples shall be dry-cleaned before they undergo the laundering procedure, i. e. , the refurbishing method includes both dry cleaning and washing.
该标准规定，所有的试样在经过洗涤程序之前应当干洗，即刷新方法同时包含了干洗和水洗。
But neither separation recycling dry gas, or directly use the ethylene production of ethyl-benzene or dry gas methyl ethylbenzene, all is recycled in FCC dry gas effective method of ethylene.
但是无论是分离回收干气中的乙烯，还是直接利用干气生产乙苯或对甲基乙苯，都是回收利用催化裂化干气中乙烯的有效方法。
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