The present status of cement mechanical replacement parts used in our country has been investigated in this paper.
本文就国内水泥机械装备备件的现状进行了调研。
Starr convinced Edwards to narrow his focus and help develop a mechanical replacement for the heart's mitral valve which controls blood flow within the heart.
斯塔尔说服爱德华兹缩小他的研究范围，集中精力，研发一个代替。
This unit group also includes mechanical repairers who perform major repairs and replacement of mechanical units on newly assembled motor vehicles.
此单元组还包括机械修理工，进行大修和更换新组装的汽车机械单位。
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