本着“以修为主，以换为辅”的原则，采取补焊措施修复锤杆裂纹，既省时，又经济，效果良好。
Introducing built in soldering to the hammer piston on the principle of replacement subject to repairing, it is proved to be time_saving, economical and with good results.
本着“以修为主、经济实用”的原则，采用“锡铋合金气焊”的方法修复B2012A型龙门刨床大面积咬伤的导轨，操作简单，修复迅速，经使用表明，修复好的设备性能可靠，运行状况良好。
According to the rule of "main task is repair, economic practical", using Sn-Bi alloy gas welding repairing method to repairr B2012A type planer guides, this method simple and quick.
在大学修管理学，以会计为主，包含电脑的使用。
University education in management with an emphasis on accounting, involving the use of computers.
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