main-wheel
5.By using a wafer-rotating grinding machine, the influence of the main process factors including grit size of diamond grinding wheel, rotating speed of the wafer chuck table, rotating speed and the down feed rate of the cup grinding wheel on the material removal rate, spindle motor current and wafer surface roughness in grinding large size wafer are experimentally investigated.
6.The 200 MW steam-turbo units in Shajiao A Power Plant have the problems of low oil pressure of the main oil pump, wear and tear of the cog-wheel coupling and thrust bearing, automatic switching inability of the pump system, etc. , which seriously impact the safety and reliability of the units.
7.Using the standard MR fluid with 0. 5 Pa·s initial viscosity, the main parameters such as working gap, relative velocity between the polishing wheel and the workpiece, concentration of CeO2 and polishing time are analyzed experimentally on the home developed MRF system, whose polishing wheel combines self-rotation movement with co-rotation.
同义词辨析
这些形容词均含有“首要的，主要的”之意。
chief: 拽人时，表同类中职位最高，权力最大；指物时，表同类中最重要，价值最高。
principal: 用于人时，指地位优于其他人；用于物时，指该物在大小、重要性等方面优于他物。
main : 通常只用于物。指在一定范围内，某物的重要性、体积或力量等超过其它物。
major: 指同其他人或其它物、问题等相比较，显得更加重要和突出。
leading: 侧重指具有影响力或凝聚力。从而有主导和引导的作用。
capital: 着重指因重要性、意义、优越或重大而名列同类之首。
foremost: 侧重指在行进或发展过程中居首位。
primary: 通常不用于人。用于物时，指在重要性方面占第一位。
