查询词典 dilute

In the presence of NaH and in DMF, the acyclic crown ethers 1a and 1b were synthesized by the reaction of di-or triethyleneglycol ditosylate and o-methoxymethoxybenzyl alcohol, which was obtained from salicylaldehyde via the protection of the hydroxyl group with chloromethyl methyl ether followed by the reduction of the formyl group with NaBH4. The hydrolysis of 1a and 1b with dilute hydrochloric acid provided the diphenolic type acyclic crown ethers 2a and 2b respectively in good yield.

将水杨醛与碱和氯甲基甲基醚反应，再经过NaBH4还原，即制得邻苯甲醇，然后将其在DMF中与NaH和二甘醇二对甲苯磺酸酯反应，得开链冠醚1a和1b.1a和1b经稀酸水解，即脱保护而分别生成新的酚型开链冠醚2a和2b。

To freckle products Tingduo, but it is to dilute the main to remove little hope.

能祛斑的产品挺多的，但都是以淡化为主，彻底清除的希望不大。

Or you can add water to dilute and then put it into sprayer as air freshener.

您也可以将精油加水稀释然后装在喷雾器里，当成空气清新剂使用。

Separation of the two components is accomplished by dissolving the frit in dilute nitric acid .

将玻璃料溶于稀硝酸中来完成两个组分的分离。

Either sodium picrate, which is converted to sodium isopurpurate, or a freshly prepared solution of guaiacum resin in absolute alcohol which is allowed to dry on the paper and treated with very dilute copper sulphate solution. The latter test-paper turns blue with prussic

acid。苦味酸钠试验：将生药研碎，取0.5g放入试管中，加数滴水润湿，加塞密闭，管口内悬挂一条用碳酸钠溶液润湿的苦味酸试纸，将试管置40～50℃水浴进行酶解，试纸转为砖红色，若是悬挂联苯胺-硫酸铜试纸，则应生成联苯胺氧化物而使试纸变蓝色。

The gunmaker sought $250 million in damages and asked the court to permanently enjoin GM from using the Beretta name for fear it would "dilute the Beretta name through GM's advertising."

这家军火制造商要求25000万美元赔偿，并要求法院下令永远禁止通用使用Beretta名字，这是因为害怕"由于通用的广告而稀释Beretta的品牌价值。"

Hahnemann further stated that the potency of a curative agent increases as the substance is dilute d.

哈内曼进一步指出，当这种物质被稀释后，其治疗的效果增加。

But China feels that an expanded SDR role could be a half-way house that could dilute the US's dominance.

但中国认为加大特别提款权的作用，是一种能够削弱美国主导地位的过渡方案。

It is the intense heat of lightning that forces the nitrogen to combine with oxygen in the air, forming nitrogen oxides that are soluble in water and fall to the earth in rain as dilute nitric acid.

闪电的高温是氮和空气中的氧化合成能溶于水的氧化氮，随雨水进入土地，稀释成硝酸。

In this paper, the progress of hemicellulose hydrolysis reaction with dilute acid is reviewed.

本文综述了半纤维素稀酸水解反应的研究进展。

I can not make it blossom and suits me

我不能让树为我开花

When temperatures are above approximately 80 °C discolouration of the raceways or rolling elements is a frequent feature.

当温度高于 80 °C 左右时，滚道或滚动元件褪色是很常见的特征。