Result hemorrhage after tooth extraction operation is always happened on local tissue injury, irregularoperation and illogical adaption choice are the major cause of hemorrhage.
结果拔牙后出血以局部组织损伤为主，操作不规范和适应证选择不合理是造成出血的主要原因。
2
The spraying technique not only has the advantages of simple equipment, convenient operation and low cost, but also can be suited for irregular base surface with complex geometry shapes.
喷涂技术不仅具有设备简单、操作方便、费用低等优点，还具有能够适应不同基体表面形状的特殊优点。
3
Acid corrosion could be used for tolerance adjustment of irregular core and core rod, replacing difficult operation of tolerance adjustment by machining.