利用固定床反应器，以固体酸为催化剂催化桐油预酯化反应。
Pre-esterification of China wood oil catalyzed by solid acid in fixed bed reactor was researched.
不同种源年梢长度对施用磷肥的反应可由其固定生长量和自由生长量的变化来解释。
This difference of sensitivity could be explained by changes of fixed growth and free growth.
不同种源年梢长度对施用磷肥的反应可由其固定生长量和自由生长量的变化来解释。
This difference of sensitivity could be explained by changes of fixed growth and free growth.
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