反应、无机N源利用、柠檬酸盐利用呈阳性，硝酸盐还原试验大多呈阳性；

B reaction, inorganic nitrogen sources utilization and citrate utilization, the results were positive. Nitrate reduction experiment presented positive largely.

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实验结果表明：利用柠檬酸盐溶胶凝胶法可以合成颗粒粒径在30 ~ 70纳米的无铅ptc陶瓷粉体。

The results showed that the lead-free PTC composites which had the size distribution of 30 ~ 70nm could be prepared by citrate sol-gel method.

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结合微波的热效应、非热效应特性，利用经改装的微波反应装置，对微波解吸柠檬酸盐溶液中SO2的过程进行了研究。

Utilizing the characteristics of microwave and the device of microwave reaction, the desorption process of SO2 in citrate solution was experimentally explored.

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