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.
易达便达飞有望在1993年和1994年实现重大转型。
Esselte Pendaflex expected to make major transitions through 1993 and 1994.
便易安装：将两座建筑顶端的红外线激光收发器简单地连接起来，然后将它们调整成行即可。
It is easy to set up: simply hook up infra-red laser transceivers on top of two buildings and then align them.
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