Saturday, February 11, 2023
Thursday, September 15, 2022
Friday, February 16, 2024
问题:钻井液滤失量过高会使钻井液密度(),进而降低钻速。...
Thursday, September 15, 2022
问题:()代号应注在可见轮廓线、尺寸线、尺寸界线或它们的延长线上。A、热处理B、公差配合C、形位公差D、表面粗糙度...
Sunday, October 1, 2023
问题:摩擦离合器的作用是接通或切断动力,实现过载保护。...
Thursday, August 24, 2023
问题:()是指加工后的零件在尺寸、形状和表面相互位置三个方面与理想零件的差值。...
Sunday, March 31, 2024
Thursday, September 15, 2022
Thursday, August 24, 2023
Thursday, September 15, 2022
问题:孔挤压加工的特点是()高,表面粗糙度低,使用工具简单,加工效率高。A、加工精度B、形位精度C、定位精度D、测量精度...
Saturday, April 15, 2023
Thursday, September 15, 2022
问题:钻井液滤失量过高会使钻井液密度(),进而降低钻速。...
Thursday, September 15, 2022
问题:减小铰刀()可减小切削层厚度,使切削平稳,能获得较细的表面粗糙度,并能提高铰刀使用寿命。A、前角B、负偏角C、主偏角D、后角...
Saturday, May 13, 2023
问题:钻相交斜深孔用麻花钻头钻头不能(),钻头刀刃、角度要对称,钻交叉...
Thursday, September 15, 2022
问题:在分度头上装夹以顶针孔为基准的轴类工件应使用双顶针和()...
Sunday, March 31, 2024
Thursday, September 15, 2022
问题:用硬质合金钻头回转钻进中硬及中硬以下岩石时()A、应以高转速为主;B、应以高钻压为主。...
Tuesday, March 28, 2023
问题:在一定切削用量的条件下,选用合适的()进行充分冷却能提高钻头耐用...
Thursday, September 15, 2022