查询词典 difficult position

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。

Objective: To study the relativity of Graves' disease leukopenia and the A/G dimorphism at position 49 of exon 1 and C/T dimorphism at position 318 of promoter in cytotoxic T lymphocyte associated antigen-4 (CTLA-4) gene in Han nationality of Tianjin.

目的：探讨天津地区汉族人Graves病合并白细胞减少，与细胞毒性T淋巴细胞相关抗原－4(CTLA-4)基因外显子1第49位点A/G和启动子－318位点C/T二态性的相关性。

Among diplomatism , they expatiated from International position including the position of Dongbei

在外交方面，则从中国所处国际形势与外交的失败来探讨速开国会的理由。

The Chinese prosodic structure syntax theory indicates that disyllable scheme has its internal existence both in its subject as initiative position and object as terminative position.

运用韵律句法理论，我们分析指出Vs的双音韵律是它具备出现在主语始发位置及宾语终止位置的先天优势的内在成因。

Aimed at the needs of divagation in virtual environment, we define the position chain, time chain, zooming chain and virtulized chain. Also, a divagation strategy is proposed for vitural panorama space containing position relationship, time relationship, zooming relationship and virtualized relationship.

针对基于图像的虚拟全景空间漫游的需要，在定义位置链、时间链、焦距链和虚化链等链表结构的基础上，提出了一种包含位置关联、时间关联、焦距关联和虚化关联的大规模虚拟全景空间漫游策略。

The position and size of the monochromator, focusing curvature radii and tilting angles of the germanium focusing monochromator under different different take-off angle, size and divergency of the second collimator and intensity loss due to the use of it were determined. The neutron flux at different wavelength, under different reflection and take-off angle of the monochromator and divergency of the first collimator, were given. The simulation on the aperture used for limiting beam size in front of the sample showed that, smaller the size of the aperture and further the distance from the aperture to the sample, greater the loss of the intensity and more serious the spread of the beam along vertical direction at the sample position which makes the practical sampling volume greater than expected.

用蒙特卡罗模拟方法对中子应力衍射谱仪的设计方案进行了优化研究，提出了一系列可供参考的数据：确定了单色器的位置、尺寸、垂直聚焦单色器在不同起飞角下的聚焦曲率半径和倾角；讨论了第二准直器的尺寸和发散，以及使用第二准直器造成的强度损失；给出了在不同单色器反射面、起飞角、中子波长和第一准直器发散度的情况下样品处的中子注量率，以及多种组合情况下谱仪的分辨率曲线；对限束方孔的尺寸、距离样品远近对强度损失和测量中的影响做了深入研究。

This paper proposes a new type position controller with neural network structure, gives it ' s learning rule , and do the simulation experiment on position servo system of NC machine.

本文提出了一种新型的神经网络结构的位置控制器，给出了该控制器的学习算法，并进行了数控机床位置伺服系统的仿真实验。

A second important point is that the wing on the downstroke must either rotate bodily into a more leading-edge-down position (ie: negative angle of attack), or the wing membrane itself must be flexible enough to twist into this new position.

第二个重要的一点是，机翼就必须要么downstroke旋转身体成为一个更领先式的立场，或翼膜本身必须具有足够的灵活性以扭到这个新职位。

The best siding withdrawing position; d. Relation between feed temperature and steam unit consumption.Both process flow and controlling method of the stripper were optimized. First, liquid among third class drainer was directly pumped in above piece board of siding withdrawing position.

分析目前炼油厂含硫污水汽提塔运行存在的问题，以模拟计算的结果为依据，从工艺流程及控制方法两方面进行优化。1将三级冷凝罐中的液体直接由泵加入侧线抽出位置的上一块板，而不将其与原料混合，回到原料罐，其他流程均不改变。

From the mechanics analysis, the relationships between the configure parameters (such as the wheel parameters and the position of mass center) and the mobility performane indexes (such as the wheel sinkage, motion resistance and drawbar pull) are obtained. The design principles of the wheel parameters, position of mass center and the wheel space are given. It is demonstrated that the mass center is crucial to the mobility performance of the lunar rover.

通过对移动性能的分析，得到了构型参数和地形参数与下陷量、运动阻力、牵引力等性能参数间的关系曲线，给出了月球车车轮、质心位置和轮距等构型参数的设计原则，论证了质心对于月球车移动性能的重要性。

"The operators will suffer a temporary decrease in the number of consumers and short message services as people may not like having to provide their ID cards for a phone number," Xu Junqi, vice-dean with the Policy-Making Institute of the Telecommunications Research Centre under MII, said yesterday.

信息产业部下属的通信决策研究院副主任徐俊其昨天说：&实行手机实名制后，人们可能不太情愿用身份证注册手机号，所以通信运营商会暂时面临用户减少和短信用户减少的问题。&

I don't believe in make-believe!

我不相信这些虚构的故事。