Friday, May 5, 2023
Sunday, September 11, 2022
问题:水玻璃砂的组成一般是()。A、石灰石,水玻璃,氯化胺B、硅砂,水玻璃,CO2C、锆砂,膨润土,煤粉D、石英砂,煤粉,膨润土
Sunday, August 20, 2023
Thursday, December 1, 2022
问题:热芯砂用原砂的粒度一般是()。A、100/50B、70/140C、140/70D、50/100
Sunday, September 11, 2022
Tuesday, September 13, 2022
问题:乘放铁水的钢包内耐火砖被侵蚀()时,即可重砌。A、20%B、45%C、50%D、65%
Sunday, September 11, 2022
Sunday, June 18, 2023
Sunday, September 11, 2022
Wednesday, June 28, 2023
问题:刚玉砂是由()经过粉碎、洗涤后电炉内2000--2400℃高温下熔炼而成。
Thursday, November 30, 2023
Friday, June 30, 2023
Thursday, December 1, 2022
Tuesday, January 23, 2024
问题:计算题:现有石英石原砂100吨,取100克作为试样,在水洗前是100克,水洗后是81克,这批原砂是否合格?
Sunday, June 18, 2023
问题:()粘结剂的硬化剂是六次甲基四胺(乌洛托品)。A、热芯树脂B、冷芯树脂C、水玻璃D、壳芯树脂
Sunday, September 11, 2022
问题:计算题:某厂进入一批原砂,现拿量筒取100ml,放入天平称重为188g,求砂的堆密度是多少?
Thursday, February 22, 2024
问题:我们可通过检测型砂的()性能来粗略地判断型砂起模韧性。
Wednesday, June 28, 2023
问题:浸涂法涂敷涂料的方法()。A、适合于单件小批量生产B、适用于成批大量生产C、比较节约涂料D、适合单件大型铸件
Monday, May 15, 2023
Saturday, November 25, 2023