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。
Position permanent guide base ( PGB) below rotary table.
在转盘下安放永久导向基板。
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。
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