Saturday, September 10, 2022
Saturday, December 9, 2023
问题:倒用初冷器,首先必须使用备用初冷器,各处正常后,才能停下要停的初冷器,不得随意开停。
Saturday, September 10, 2022
Saturday, November 11, 2023
问题:对于纯液体来说,一定温度下的饱和蒸汽压就是该液体的挥发度。()
Thursday, April 18, 2024
Saturday, December 2, 2023
Monday, February 6, 2023
Friday, December 16, 2022
问题:巴氏合金轴瓦浇铸后,合金层发渣,失去弹性和塑性是因为巴氏合金浇铸过热引起的,浇铸温度范围是380-420℃。
Sunday, May 28, 2023
Sunday, September 11, 2022
问题:碳素钢分为低碳钢和高碳钢,合金钢又分为低合金钢和高合金钢。
Thursday, April 18, 2024
Saturday, May 4, 2024
Saturday, November 11, 2023
Saturday, November 11, 2023
Friday, March 8, 2024
Thursday, April 18, 2024
问题:当用蒸汽涡轮机带动鼓风机时,调节鼓风机煤气量的手段有哪些?
Saturday, December 2, 2023
Saturday, December 2, 2023
问题:坡口的选择主要应考虑以下因素:()A、尽量减少填充金属量;B、保证熔透,避免产生各种焊接缺陷;C、改善施焊劳动条件;D、减少焊接变形和残余变形量。
Saturday, September 10, 2022
Sunday, September 11, 2022