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。
Objective To investigate the use of warfarin sodium after mechanical heart valve replacement.
目的研究心脏机械瓣膜置换术后华法林钠的应用。
Methods To select 20 cases of patients undergoing mechanical heart valve replacement.
方法选择20例择期行心脏机械瓣膜置换术的患者。
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