Tuesday, September 13, 2022
Saturday, June 8, 2024
问题:下面()原砂的粒度最细。A、50/100B、70/140C、140/70D、40/70
Monday, September 2, 2024
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
Thursday, December 1, 2022
问题:冷芯盒用树脂的组成是()。A、聚异氰酸脂与聚苄醚酚醛树脂B、水玻璃与二氧化碳C、苯酚与甲醛D、亚麻子油
Saturday, April 13, 2024
Tuesday, January 23, 2024
问题:高岭土是典型的()粘土矿物。A、三层型B、一层型C、二层型D、无定型
Thursday, December 1, 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:()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: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, September 11, 2022
Friday, January 27, 2023
Friday, May 5, 2023
Saturday, June 8, 2024
问题:要求涂刷的钢锭模其模温应保持在()。A、10~20℃B、20~60℃C、60~70℃D、80~120℃
Thursday, June 13, 2024
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
Saturday, June 8, 2024
Tuesday, January 23, 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