It has been proved in practice that these measures can improve not only the cracking severity but also the ethylene yield.
实践证明，采取措施后，裂解深度及乙烯收率均有较大的提高。
It has been proved in practice that these measures can improve not only the cracking severity but also the ethylene yield.
实践证明，采取措施后，裂解深度及乙烯收率均有较大的提高。
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