查询词典 pres.

In this paper, the improvement of synthetic method of 2-acetylaminotropone is introduced. 3-Acetyltropolone reacted with low concen-tration methylamine solution and solvent was directly evaporated in reduce pres-sure to give 2-acetyl-7 -methylaminotropone in good yield. The compound reacted with phenyltrimethylammonium tribromide to give two new compounds.

本文介绍2-乙酰基-7-甲胺基酮合成方法的改进——用挥发性小的低浓度甲胺溶液与3-乙酰基酚酮反应；和采用直接减压蒸除溶剂法分离产品，得到较好产率的2-乙酰基-7-甲胺基酮；用化合物与三溴化苯基三甲铵反应，得到两种至今未见文献报道的新化合物。

Estimated; pres.-preserved;-unapplicable or not preserved

中图分类号：P588.3；P597+。3 文献标识码：A

Unvulcanized sheet material is vulcanized/molded in three dimensional shape without applying pres- sure.Thus,no dimensional change occurs due to freedom from stress relaxation and accurate metering is maintained after its long use with gasmeter.

在施加压力情况下，对未硫化成型的薄布材料实施全面的硫化定型，因此，在煤气表内部不会因为施加压力而改变尺寸，也不会因为长期使用而改变尺寸。

In order to increase the use value of lycoramine,it was dehydrogenated selectively in the pres- ence of 9% rare earth metal hydride at 240℃,affording galanthamine with 45.9% yield and 97% optical purity by semi-synthesis.

加兰他敏提取工艺中的主要副产品--力可拉敏的药用价值明显低于加兰他敏，为提高力可拉敏的利用价值，在催化剂存在下脱氢制取加兰他敏。

After pericardial effusion,the diastolic pressure of right ventricle and pulmonary vein pres-sure pulsated with intrathoracic pressure;the pressure of carotid vein and femoral vein were still stable.

颈内静脉及股静脉压较稳定，波动幅度较小，分别为0.06kPa和-0.06kPa；心包填塞后，胸内压呼吸性波动加大，左右心室舒张压、肺静脉压的波动幅度随之加大，但颈静脉压及股静脉压仍较稳定。

This paper discusses such design problems in heating systems with the pres- sureless boiler as how the pumping head of the cycle pump is selected ,where the cycle pump is installed and whether the expansion tank is necessary.

针对无压锅炉供暖系统设计中有关循环水泵扬程的选择、循环水泵的设置高度及是否设置膨胀水箱等问题从理论和实践上进行了探讨，得出了可供设计人员实际应用的计算公式，介绍了几个关键问题的处理方法，澄清了一些模糊认识。

DEMISTER~ style 713 knitted mesh mist eliminator provides increased efficiency with low pressure drop in drying towers,FLEXIFIBER~ BD-LdP Brownian Diffusion candle mist eliminator provides reduced pres- sure drop with no loss in efficiency in absorption towers and FLEXIFIBER~ ICK-LF impaction candle mist elimi- nator provides increased service life with no loss in efficiency in drying and fin...

DEMISTER~型713丝网除雾器，在干燥塔中使用可提高效率且具有较低的压力降；FLEXIFIBER~BD-LdP布朗扩散型烛式除雾器，在吸收塔中使用可减小压力降且无效率损失；FLEXIFIBER~ICK-LF碰撞型烛式除雾器，在干燥塔和二吸塔中使用可延长使用寿命且无效率损失。

Please allow me to express our sincere thanks to Sirs and Madams as well as the pres IDE nt of Saigon Viem and our Vietnamese partners for your coming to witness this exciting moment on behalf of our overseas team.

为此，我代表长城公司海外业务团队向今天到来的所有来宾以及我们的合作伙伴，Saigon View的总裁先生和所有长城的越南代理及媒体朋友表示衷心感谢，感谢你们和长城一起见证这激动人心的一刻。

On the basis of improved continuous flow equation,the mathematical model that expresses the interrelationship of the liquid pressure,the movement of plunger piston and the pump barrel clearance were setup,and simulating model s of the liquid instantaneous pres.

根据改进的连续流方程，建立了泵筒内液体压力、柱塞运动规律与柱塞泵筒间隙之间相互关系的数学模型，从而建立了泵筒内液体瞬时压力与泵示功图的仿真模型。

The XDR2 preamps deliver pure, clean studio-grade sound-the kind of quality you'd expect to find in pricey boutique mic pres.

前置的XDR2提供纯，干净的棚级的声音什么样的质量您希望找到在昂贵的精品麦克风压力。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。