presence的例句大全

DMC was prepared by cracking reaction of the waste silicone products, which were the waste silicone oil and waste silicone rubber tailings, in the presence of dodecyl benzene sulfonic acid and catalyst.

以废有机硅制品（如废硅油、废硅橡胶制品下脚料等）为原料，在十二烷基苯磺酸和催化剂存在下裂解，得到硅氧烷混合环体。

The reaction of benzotrichloride and chloroacetic acid to form chloroacetyl chloride and benzoyl chloride in the presence of catalyst was studied.

研究了三氯甲苯和氯乙酸在催化剂存在下反应生成氯乙酰氯和苯甲酰氯的工艺条件。

This paper described the mechanisms of synthesis of benzyl acetate by tetranbutylammonium bromide in the presence of phase transfer catalyst, and such factors as temperature, time are also discussed.

该文描述了相转移催化剂存在时合成醋酸苄酯的机理，对反应温度、反应时间等因素也进行了讨论。

Benzyl alcohol is the most important aromatic alcohol. Nowadays benzyl alcohol is synthesized by the hydrolysis of benzyl chloride in the presence of alkali, but with almost 10-20% benzyl ether, the by-product.

苯甲醇是最简单的，也是最重要的芳香醇，目前合成苯甲醇主要是通过氯化苄直接碱性水解，但是现有方法的副产物二苄醚含量达到10%～20%。

Benzyl benzoate was synthesized by the esterification of sodium benzoate and benzyl chloride in the presence of water and triethylamine which was taken as the phase transfer catalyst.

研究了在有水存在下，利用相转移催化剂三乙胺催化苯甲酸钠和氯化苄的酯化反应。

The synthesis of benzyl propionate from propanoic aid, sodium hydroxide and benzyl chloride in the presence of PTC was studied.

本文研究了用相转移催化合成丙酸苄酯的方法。

A robust estimator of local shape is very useful and important when the given point sets are in the presence of noises.

当一个给定的点云中存在噪声时，对局部形状的稳健估计是非常有用且重要的。

Also notice the presence of a Boolean variable named init.

另外还要注意名为init的Boolean变量的存在。

Results Compared with natural delivery, in presence of assisted breech delivery, breech extraction, application of vacuum extractor, and cesarean section, the incidence rate of neonatal asphyxia increased significantly ( P < 0.01).

结果①臀位助产、臀位牵引、胎头吸引术、剖宫产术的新生儿窒息率经统计学处理明显高于自然分娩率（P<0.01）；

The presence of saturable absorber also has influence on laser mode.

本文提出可饱和吸收体Cr4+:YAG在激光谐振腔中可具有横模选择的作用.

Microcellular foams are developed materials characterized by the presence of multiple small cells.

微孔发泡塑料是一种内部含有很多小泡孔的新型材料,具有很多优异性能.

Maintaining a presence and ever improving relationship with major customers through service calls.

通过技术服务来维护和加强客户关系.

The liquefaction behaviors in the presence of iron-based catalyst and without any catalyst were compared.

研究了以四氢化萘为溶剂,蔗渣分别在铁系催化剂和无催化剂作用下的液化反应.

Each new apartment had traces of his presence there; some cigarette butts and the remnants of take-away meals.

每处新公寓都有他在那里住过的痕迹：几个烟头和外卖的残迹。

Could we have the honour of your presence at the party?

你能赏脸亲临晚会 吗 ?

Web.com Group ( WWWW) specializes in providing small businesses with programs designed to increase their presence on the Internet.

Web.com集团（WWWW）专门为小企业提供旨在增加其在互联网上的影响力的程序。

Then you will have glory in the presence of who at the table with you.

那时,你在同席的人面前就有光彩了.

Having the exclusive selling rights for seasonaBle fresh fruits, we are awaiting your presence and negotiation.

本店包销时令鲜果, 欢迎客商前来洽淡.

A single equilibrium model of spot market in absence of future market and general equilibrium model between spot and future markets in presence of future market are derived.

本研究构建了不存在期货交易的现货市场单均衡模型和存在期货交易的期货市场、现货市场一般均衡模型。

But acknowledging fire's inevitable presence in human life is an attitude crucial to developing the laws ， policies , and practices that make it as safe as possible，she says.

她提到:但是承认“火是人类生活中不可避免的存在”是一种态度，这一态度对于制定保障尽可能安全用火的法律、政策和实践来说，是至关重要的。