结论PPD实验材料简单，创伤小，强阳性率高，患者顺应性好，是临床活动性肺结核简而易便的有效辅诊技术。
Conclusion PPD skin test plays an effective part in the diagnosis of APTB, thanks to its easy to use, less invasion, high positive rate and good patients' compliance.
利用非简谐振子模型计算了三阶非线性极化率。
Finally the universal formula of higher order nonlinear polarizability has been given.
高効率低特性部分共振电源简単构成设计时间短缩可能。
Fabrication of high-efficiency and low-noise partial resonance power supplies is much simplified, and designed time is reduced.
利用非简谐振子模型计算了三阶非线性极化率。
Starting from the nonlinear resonance pattern, we calculated third order polarizability, and gave the principle of the calculation.
该工艺产率高，工艺简，反应时间短，无腐蚀，无污染。
This process has many advantages such as higher yield, simple procedure, shorter reaction period, non corrosive, non pollution, etc.
试验结果表明该组合油环在控制机油消耗率、缸简磨损和组合油环磨损等方面均取得了满意的结果，在CA6102发动机上得到了广泛的应用。
The test results indicated that the controlling of oil consumption, wear of cylinder and the oil ring were satisfactory. The Developed oil ring has been adopted on the CA6102 gasoline engine.
试验结果表明该组合油环在控制机油消耗率、缸简磨损和组合油环磨损等方面均取得了满意的结果，在CA6102发动机上得到了广泛的应用。
The test results indicated that the controlling of oil consumption, wear of cylinder and the oil ring were satisfactory. The Developed oil ring has been adopted on the CA6102 gasoline engine.
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