Study the technologic conditions of preparing Grignard reagent benzylmagnesium chloride under ultrasonic condition.

Di-Grignard Reagent and mono Grignard Reagent were prepared using 1, 4-dibromobutane.

以1, 4- 二溴丁烷为原料,分别制备了双格氏试剂和单格氏试剂.

The article summarizes the preparation. structure and chemical nature of Grignard reagent.

本文综述了格氏试剂的制备, 结构及其在有机化学中的应用.

Shanxi Xinzhou Chemical Reagent Factory, established in 1971, has a production history of thirty years.

山西省 忻州市 试剂化工厂建于一九七一年, 已有三十年的生产历史,是全国最大的醋酸钠生产厂家.

This base will focus on the developing of electronic chemical products, chemical reagent, biological chemistry etc.

该区域重点发展电子化学品 、 化学试剂 、 生物化工等产业.

The 2 D-X chemical reagent resin-reinforced was used to modify the palm fibers.

采用环保型2D-X树脂增强试剂对棕叶纤维改性,以增加湿强.

Shopping should be clear advice, can not be a tax rebate would be lost.

购物时要咨询清楚, 否则不能退税就会受到损失.

Self-and proxy tax, a tax rebate relations are not the same apply when certain clear.

自营和代理纳税 、 退税关系不一样,办理时一定搞清楚.

China needs to improve its tax rebate system.

五是退税机制亟待完善.

Many papers have discussed the relationships between recall ratio and precision ratio.

有多篇文章讨论了查准率和查全率之间的种种关系.

Voluntary stop of sales and recall from consumers.

自愿停止销售,并从消费者手中召回.

Voluntary stop of sales, recall from consumers and destruction by an importer.

进口商自愿停止销售该产品, 此外从消费者手中召回并销毁缺陷产品.

Voluntary recall from consumers and corrective actions taken by the importer.

进口商自愿从消费者手中召回缺陷产品并采取补救措施.

It is a decigone beyond recall.

那是一项无法挽回的决定.

The things I said to her during the argument was beyond recall.

在争吵时我对她说的话已经无可挽回了.

It is gone beyond recall.

它已经一去不复返了.

The new law is now established beyond recall.

新法律现已制定,不得撤销.

The company decided to recede from a bargain.

公司决定撤销买卖合同.

Judging form the recent situation in the Middle East, I think War Risk should be covered.

从最近中东局势来看, 我认为应该投保战争险.

But judging from the recent situation in Kosovo, I think War Risk should be covered.

但是从科所沃目前的形势看, 我认为应该投保战争险.

The characteristics, applications, and recent situation of development of moisture-curable polyurethane hot melt adhesive are introduced.

简要介绍了湿固化聚氨酯热熔胶的特点 、 应用和发展近况.