民用飞机和国际列车需要经常进行检疫和喷雾杀虫。喷杀虫药要求每立方米空气用药量不超过一毫克,而一般喷药器喷撒加大几十倍药量也不能把昆虫完全杀死,必须用加有增效剂的气雾剂。但这种气雾剂我们还不能生产,只好从外国进口,每年需要花费大量外汇。天津第二香料厂的广大职工,了解到这种情况后,决心甩掉洋拐棍,自 Civil aircraft and international trains require frequent quarantine and spray insecticides. Insecticides require no more than one milligram of air per cubic meter of air. In general, sprayers that spray dozens of times more do not completely kill insects. They must use aerosols with synergists. However, we cannot produce this kind of aerosol and we have to import it from foreign countries. It takes a lot of foreign exchange each year. The employees of Tianjin No.2 Perfume Factory, after learning of this situation, decided to get rid of the stick, since