ptb

Was There a Mass Extinction of Land Plants at the Permian-Triassic Boundary ( PTB )?

陆生植物在二叠纪 - 三叠 纪 界线存在集群灭绝 吗 ?

Stone Image Statue Conclusion: PTB have some distinguished ultrasonic characteristics.

结论：PTB在超声图像上，有一些特征表现。

Objective : To detect environmental risk factors type 2 diabetes mellitus complicated with pulmonary tuberculosis ( T 2 DM-PTB ).

目的: 探索2型糖尿病并发肺结核 ( T2DM-PTB ) 的环境危险因素.

Object To understand the compliance with treatment and influence factors in senile PTB Patients.

[目的]了解老年肺结核患者的治疗依从性及其影响因素。

On this basis, introduced PTB profiles and project communication management problems at different stages.

在此基础上介绍了PTB项目概况以及项目不同阶段沟通管理存在的问题。

Objective To evaluate the value of two dimensional ultrasonography in diagnosing pancreatic tuberculosis ( PTB ).

目的探讨二维超声在胰腺结核诊断中的价值.

An intercomparison of RF voltage standards between the NIM of China and the PTB of West Germany was carried out in Beijing, in July 1986. The results show that the RF voltage standards of the two countries are in good agreement.

本文介绍1986年7月中国计量科学研究院与联邦德国物理技术研究院就两国的射频电压标准进行的一次比对，比对结果表明，两国的标准是非常一致的。