Tuesday, March 26, 2024
问题:离心泵在开泵和停泵时,泵的出口阀应处于关闭还是打开状态,为什么?
Tuesday, May 7, 2024
Tuesday, April 30, 2024
Wednesday, April 3, 2024
问题:在化工生产中常涉及非均相物系的分离,请简述分离的方法和原理。
Tuesday, April 30, 2024
Wednesday, January 24, 2024
Saturday, May 11, 2024
Wednesday, January 24, 2024
Tuesday, April 30, 2024
Tuesday, May 7, 2024
Saturday, May 11, 2024
问题:在化工生产中,按照生产、使用、储存的化学物质的性质及数量来分,生产的火灾危险性分为几类?各举一例。
Tuesday, April 23, 2024
Saturday, May 11, 2024
Saturday, May 11, 2024
Wednesday, April 3, 2024
Saturday, May 11, 2024
Saturday, February 24, 2024
Tuesday, April 30, 2024
Tuesday, March 26, 2024
Monday, May 6, 2024