前驱

Aluminum Ispropoxide was hydrolyzed to prepare Al〓O〓 sol. The hydrolyzed 〓CHOH affected the sol peptization. The colloidal particle was the smallest when the peptization time was 12 hours.γ-Al〓O〓 membrane without cracks, thickness about 2μm, was prepared from 1M sol with a suitable amount of PVA solution. The mean pore size of the membrane was about 3nm. And, the H〓/N〓 separation factor was 3. 53, exhibiting good separation performance.

异丙醇铝为前驱体，水解制备Al〓O〓溶胶，水解产生的异丙醇影响溶胶的胶溶效果，并且胶溶12小时得到的胶粒最小。1M溶胶加PVA制备厚度2μm左右，无开裂γ-Al〓O〓膜，经600℃煅烧，平均孔径为3nm，H〓/N〓分离系数可达到3.53，表现了很好的分离性能。

Therefore, coal tar pitch modified with 4-MB was qualified to be an excellent carbon precursor.

因此，改性后的煤沥青有望作为优质的炭材料基体前驱体。

The more portly abishai had to puff and scurry to keep up.

矮胖的朋友不得不疾步前驱才能赶上它同伴的脚步。

Potassium silver cyanide and potassium gold cyanide, which stability constants are very large, were used as the starting materials for the preparation of silver and gold powders. Adjusting the concentration ratio of protective agent to reducing agent and other reaction conditions can control the size, shape and morphology of precious metals nanoparticles.

使用氰化亚金钾和氰化银钾等稳定常数很大的金和银配合物作为制备纳米金粉和银粉的前驱体，控制保护剂／还原剂的比例以及其它反应条件，可以有效地控制粒子的大小、形状以及粒子聚集体的形貌。

Al and SiC powders were chosen as active filler and inert filler, respectively, for the fabrication of preceramic-derived multi-phased ceramics, using polycarbosilane as preceramic precursor.

采用微米级Al粉作为活性填料， SiC微粉作为惰性填料，聚碳硅烷作为陶瓷前驱体制备SiC基复相陶瓷。

Al and SiC powders were chosen as active filler and inert filler,respectively,for the fab- rication of preceramic-derived multi-phased ceramics,using polycarbosilane as preceramic precursor.

采用微米级Al粉作为活性填料，SiC微粉作为惰性填料，聚碳硅烷作为陶瓷前驱体制备SiC基复相陶瓷。

But as a consumer, this precursor of luxury cars sold in the amount of money?

但是作为消费者来说，这种前驱的豪华车该卖多少钱呢？

These data show that precursory waves can not be generally detected during 15 day before earthquake.

两项统计数据显示，震前15天之内不能普遍检测到地震前驱波。

Objective To explore clinical features of premonitory symptoms between familial and sporadic schizophrenics to provide bases for clinical prevention and cure.

目的 探讨家族性与散发性精神分裂症患者前驱症状的临床特征，为临床防治提供依据。

His attempts on the making of images about exotic cities provided premonitory significance to the development of the modernity in Chinese New Poetry.

这些异域城市意象创造的尝试，在新诗现代性的发展中，具有美学探索的前驱性的意义和价值。

I will endeavour to find you some assistance.

我尽力帮你找人帮忙。

At first I only know bruck is the idol of American younglings, afterwards I returned back to Taiwan ,even in Beijing last year ,I saw her poster everywhere, I was so surprised at her charm.

起初我只晓得布鲁克雷德丝是美国少男少女崇拜的偶像，后来回台湾，甚至去年在北京，居然也四处看见她的海报，才惊讶她的魅力之大。