三原子的

In Chapter 3, A atom laser is defined, and its elements are detailedly described.

在第三章中，原子激光器的定义被给出，它的组成要素被详细地描述。

One was HF/pyridine diazotization reaction at the 4-position of fluorene ring, and the other was Grignard reaction on the 9-position with Grignard reagent of pentafluorochlorobenzene.

使用HF/吡啶法在芴环的4位引入了氟原子，使用五氟氯苯格氏试剂在芴环的9位引入了全氟苯，合成了五个氟取代三联(9，9-二苯基)芴化合物。

It is found that the precision of the three-level atom gravimeter can be increased simply by change the sequence of the optical pulses.

我们发现通过选择合适的光脉冲序列，可以提高三能级原子重力仪的精度。

We introduced a method that can improve the measurement precision of the three-level atom gravimeter by changing the sequence of the pulses.

提出了一种通过改变激光脉冲序列来提高三能级原子重力仪的测量精度的方法。

Then we study indetail the two-photon micromaser injected with ultracold two- and three-level atoms.

然后对超冷二能级和三能级原子注入的双光子微脉塞进行了系统的研究。

The calculated results indicate that Chens lattice inversion method was exact for radial interatomic potential of alkali metals with much faster convergence than CGE method.

计算表明，陈氏三维晶格反演比CGE方法具有更快的收敛性，容易获得较高精度的原子间相互作用势。

Our synthesis is characteristic of ready availability of starting material (piperonal, ethyl oxalate, allyl bromide, ethyl 4-bromobutyrate), operationally simple reactions with cheap reagent chemicals, and atom economy.

在合成过程中，我们没有使用任何保护基，也没有将反应活性中心氮原子钝化；相反地，利用这一富电子活性中心的许多反应来构筑我们的三尖杉碱环系。

Prenex normal form of the first order logic propositional is the key to propositional logic. Generally, there are three steps to change get a prenex normal form: first of all get rid of the connection word; Secondly, make the negative word to the front of every atomic.

对于一阶谓词化为其前束范式问题，一般可以通过三个步骤完成，首先去掉逻辑式中的连接词；其次将否定词深入到各原子公式中；最后利用永真等价式将量词逐个移到式子的前部。

Containing three univalent basic atoms or radicals per molecule.

三碱式的每个分子中含有三个一价碱性原子或原子团的。

Analytical results showed that the upper clear liquid of pyrolysis oils was mainly consisted of water-soluble substances,such as phenol,cresol,xylenol,sugars,hydantoins,morpholines,pyranones and pyridine derivatives compounds,etc.,while the lower sediment was mainly insoluble or hardly water-soluble substances,such as the big substituent phenolics(the number of substituent carbon atoms of which is greater than or equal to 2),aryl phosphate esters,fatty acid esters and nitrile compounds,and so on.

研究表明，热解油上层清液主要是一些较易溶于水的物质，如苯酚、甲酚、二甲酚、糖类、乙内酰脲类、吗啉类、吡喃酮类和吡啶类化合物等；而下层沉淀则主要为不溶或难溶于水的物质，如大取代基酚类（取代基碳原子数≥2）、磷酸三芳基酯类、脂肪酸酯类和腈类化合物等。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。