问题:合物被加热到一定温度时或在一定真空条件下分解为一种更简单的化合物或金属和气体的一种过程叫()
Thursday, September 15, 2022
Tuesday, August 29, 2023
问题:高冰镍的铜镍分离方法:A、分层熔炼法B、()C、选择性浸出法
Friday, September 16, 2022
Friday, September 16, 2022
Saturday, September 7, 2024
Thursday, September 15, 2022
Friday, August 2, 2024
问题:有一铁基粉末冶金齿轮在成形后一端出现了掉边、掉角现象,请提出相应的解决这一技术问题的方法。
Thursday, September 15, 2022
Friday, September 16, 2022
Thursday, September 15, 2022
问题:配料和加料的基本原则包括成分原则、质量原则、工艺原则、()和()。
Wednesday, January 3, 2024
Friday, September 16, 2022
Friday, September 16, 2022
Thursday, September 15, 2022
Wednesday, June 28, 2023
Friday, March 24, 2023
Thursday, September 15, 2022
问题:引起氧枪喷孔堵塞,造成高温熔池产生的燃气倒灌回火的是()。A、氧枪中氧气的压力过低B、氧枪内积水汽化C、氧枪冷却系统回水不畅D、氧枪中氧气的压力过高
Thursday, September 15, 2022
问题:粗TiCl4的精制时高沸点物质和低沸点物质分别用什么方法去除?
Friday, September 16, 2022