问题:支承轴瓦内的巴氏合金应为强度较高、耐磨性较好的锡基巴氏合金,化学成分和理学性能应符合要求。
Sunday, November 5, 2023
Friday, September 15, 2023
问题:心泵的能量损失是指()。A、容积损失,机械损失B、机械损失,水力损失C、容积损失,水力损失D、容积损失,机械损失,水力损失
Sunday, July 9, 2023
Monday, March 13, 2023
问题:液压传动和气压传动系统中()动力元件,执行元件,控制元件,辅助元件四部分。A、只有液压传动B、只有气压传动C、两者均包括
Wednesday, June 21, 2023
Saturday, February 24, 2024
Saturday, December 31, 2022
问题:通过圆形阀盘在阀体内的升降以改变阀盘与阀体间的距离,从而调节流量的阀门是()。A、闸阀B、截止阀C、止回阀D、球阀
Wednesday, July 26, 2023
问题:安全阀在安装前或在容器定期检验时,都应进行耐压试验和气密性试验。
Sunday, March 5, 2023
Sunday, July 9, 2023
Sunday, July 9, 2023
问题:往复泵的特点之一是单机输出流量大而连续,无脉冲,运行平稳。
Saturday, February 24, 2024
Sunday, April 23, 2023
Friday, September 15, 2023
Friday, October 13, 2023
问题:支承轴瓦内的巴氏合金表面无裂纹、气孔、夹渣和毛刺等缺陷。
Sunday, February 19, 2023
Sunday, April 23, 2023
Sunday, March 5, 2023
Sunday, November 5, 2023