一步法

The effects of PESA on CaCO3 scale diameter and scale shape were investigated by size distribution measurement and SEM respectively.

以顺丁烯二酸酐为原料一步法合成了聚环氧琥珀酸，并对产物进行了IR和13C NMR表征。

POY and FDY oiling agent s on wetting, friction, heat-resisting, attrition-resisting properties, etc.

比较了国产和进口的适用于涤纶高速纺丝的预取向丝油剂及一步法牵伸丝油剂的润湿、摩擦、耐热、耐磨等性能，经实际生产应用证明二者的可纺性、上浆性、染色率基本相同。

Using the readily available optically active propargylic amines, the corresponding -α-chloroalkylidene-β-lactams with high ee values can be synthesized conveniently.

同时我们实现了由光学活性的炔丙基胺一步法生成光学活性的β-内酰胺化合物，这不仅在学术上而且在工业合成上都将具有非常重要的意义。

From May 2005 to April 2006,annual distribution of Citrus psorosis virus on the leaves and shoots of Dweet tangor seedlings was detected by using one-step RT-PCR once a month.

2005年5月到2006年4月逐月采样，运用一步法RT-PCR检测 Citrus psorosis virus在Dweet橘橙苗木叶片和枝皮中的分布。

The total yield of pyruvaldehyde was 37 8%.With npotassium dichromate...

后者为一步法，操作简便，产品纯度较高；产率比前法提高 12 %。

A general method for preparing multi-cyclic indolizine compounds(1a—1c, 2a—2b and 3) in moderate yields(45%—71%) by a 1,3-dipolar cycloaddition reaction of pyridinium N-ylides, isoquinolinium N-ylides or quinolinium N-ylides to 1,4,4a ,8a-tetrahydro-1,4-methanonaphthalene-5,8-dione, followed by an aromatization, in the presence of tetrakispyridine cobalt dichromate is described.

在 [ 4Co( HCr O4 ) 2 ]存在下，吡啶叶立德、喹啉叶立德或异喹啉叶立德分别和 1 ，4，4a，8a-四氢-1 ，4-桥亚甲基萘-5 ，8-二酮反应，一步法合成了中氮茚类多环化合物( 1 a～ 1 c，2 a～ 2 b，3 )。该方法原料易得，反应条件容易控制，为合成这类化合物提供了新方

A clean production technology of sodium sulfoxylate formaldehyde by one-step process with sodium pyrosulfite ,zinc powder and formaldehyde as raw materials was studied in detail.

详细研究了以焦亚硫酸钠、锌粉和甲醛为原料，一步法合成甲醛合次硫酸氢钠的清洁生产工艺，其最佳操作条件为：焦亚硫酸钠与锌粉物质的量比约1∶2.5，焦亚硫酸钠与甲醛物质的量比约1∶2.1，亚硫酸氢钠溶液的pH 3.3~3.6，活化温度≤45℃，最高温度97~102℃，高温反应时间

Phenolic resin/montmorillonite hybrid resin were prepared by Zn_2 catalyst and cured by p-toluene sulphonic acid through one step process in this paper.

在醋酸锌催化剂作用下，采用边缩聚边插层的一步法制备了酚醛树脂/蒙脱土杂化树脂，并采用对甲苯磺酸为室温固化剂制得酚醛树脂/蒙脱土复合材料。

Glycerol polyether 3010, tolylene diisocyanate , 1,4-butanediol and catalysts are used as raw materials to preparecasting polyurethane elastomer in one step.

以聚醚多元醇3010，甲苯二异氰酸酯，1，4-丁二醇和催化剂为原料，采用一步法来制备浇注型聚氨酯弹性体。

Application of PTCD with pigtail-shape transfixion pin in one step for interventional therapy of liver and kidney cyst LUO Chuan-bin,OU Guang-qian.

5 cm肝肾囊肿用猪尾型穿刺针一步法PTCD治疗肝肾囊肿治疗方法简便实用、安全，治愈率和有效率明显提高。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失