查询词典 PPH

In order to provide quality FRPP pipe, PP pipe, PPH pipe, PE pipe, tube and services.

为向用户提供优质的FRPP管材，PP管材，PPH管材，PE管材、管件及服务。

Founded in 1990, now covering 45,000 square meters, existing staff of 168 people, of whom 32 were technical staff, the production FRPP pipe, PP pipe, PPH pipe, PE pipe 12,000 tons.

公司始建于1990年，现占地45000平方米，现有员工168人，其中技术人员32人，年生产FRPP管材，PP管材，PPH管材，PE管材12000吨。

Objective: To compare PPH plus haemorrhoidectomy and Milligan-Morgan methods of severe haemorrhoids.

目的：比较PPH结合痔切除与传统式手术治疗环状混合痔的临床效果。

The PPH after Miles operation is often lack of typical clinical manifestations.

Miles术后PPH常缺乏典型的临床表现，早期诊断和及时剖腹探查是处理的关键，其重点在于预防。

pph is a simple,safe,effective method with minimal invasion and few complications for rectal sessile polyp.

pph切除直肠广基息肉是一种简便、安全、有效和术后并发症少的微创治疗方法。

This term should not be construed to mean that because it has a single name it is a single disease. There are likely many unknown causes of PPH.

不能单单因为给这种病单独起个名就把它理解成单一的疾病，PPH可能有很多不明确的原因。

To observe the cure effect of hands-sewing PPH on naevus.

［目的］探讨手缝PPH治疗痔的疗效。

One month and six months after operation, anoscope examination revealed 6 cases with hyperplastic anal cushions near anastomosis in PPH group and 1 case in ligation group.

1个月、6个月两次肛镜检查 PPH组在吻合口近或远侧有隆起增生的肛垫组织6例，改良分段结扎组1例，两组均无症状与不适。

The selective behavior on the hydrogenation of maleic anhydride to succinic anhydride and γ-butyrolactone has been investigated by RuCl〓/PPh〓 catalytic system.

以RuCl〓／PPh〓为催化剂体系，考察了反应条件对顺酐均相加氢生成琥珀酸酐和γ-丁内酯的选择性影响。

The chapter two was focused on the samarium diiodide promoted organic reactions and their applications in organic synthesis, firstly, a new synthesis of highly substituted cyclopentadienes from a,β-alkynone promoted by samarium diiodide was investigated and the highly substituted cyclopentadienes were prepared in moderate to good yields under mild conditions. Secondly, the Michael addition and Michael-aldol tandem reaction of diorganyl diselenides or diorganyl disulfides with α,β-alkynones mediated by samarium diiodide were studied and a series of alkenylsulfides and alkenylselenides were prepared in good yields. Then the highly regioselecfive nucleophilic addition of the allylsamarium bromide to α,β-alkynones were explored. We found that the allylsamarium bromide reacts with α,β-alkynones to afford regiospecificly 1. 2-nucleophilic addition products in good yields under mild condition. At last we studied the coupling reaction of aryl halides promoted by NiCl〓/PPh〓/Sm〓.

第二章 研究了二碘化钐、金属钐促进的有机反应：1、二碘化钐促进下α，β-炔基酮的偶联环化反应，提供了一种制备多取代环戊二烯的新方法；2、二碘化钐促进下的二硫醚、二硒醚与α，β-炔基酮的Michael加成反应，为高产率地制备多取代的烯基硫或烯基硒化合物提供了方便可靠的新方法；3、二碘化钐促进下的二硫醚、二硒醚与α，β-炔基酮和醛、酮的Michael—aldol串联反应，提供了一种一锅法高产率地制备多取代的含硫的烯丙基醇或含硒的烯丙基醇类化合物的方便可靠的原子经济性的新方法；4、烯丙基溴化钐与α，β-炔基酮的高度区域选择性的1，2-亲核加成反应；5、NiCl〓/PPh〓/Sm〓促进的卤代芳烃的偶联反应-一种从各种卤代芳烃制备联苯类化合物的有效方法。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。