PGB

Position permanent guide base ( PGB) below rotary table.

在转盘下安放永久导向基板。

If pre-drilling mode was taken in an offshore oil development, PGB-free well drilling technology might be adopted for supplementary wells when the PGB slots were totally occupied.

采用预钻井方式开发的海上油气田，对水下钻井基盘钻井槽孔用完后增钻的调整井，可采用无基盘钻井方式作业。

We conducted an indirect meta-analysis to compare the efficacy and tolerability of DLX with PGB and GBP in DPNP, using placebo as a common comparator.

对治疗糖尿病周围神经性疼痛（DPNP）的疗效和耐受性，我们进行了间接的Meta分析，同时使用安慰剂组作空白对照。

APGBI scoring systems can accurately pr edict operative mortality in patients undergoing colorectal cancer resection.

结论:APGBI及Cr-POSSUM 评分系统能较准确地评估结直肠癌患者手术风险性.