采用电解银表面化学修饰法研究了铼对乙烯环氧化反应的助催化作用。
The promoting effect of Re for ethylene epoxidation was investigated on Re modified electrolytic silver surface.
根据试验结果分析了自然气候对聚乙烯管材的老化作用。
The ageing effects of natural weather conditions on the pipes were analyzed.
根据试验结果分析了自然气候对聚乙烯管材的老化作用。
The ageing effects of natural weather conditions on the pipes were analyzed.
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