Electron-deficient conjugated systems are often involved in a variety of annulation reactions as electrophiles. However, the phosphine-catalyzed annulations of electron-poor conjugated systems are rarely touched.

1、

Based on frauhofer diffraction integral formula, the calculation and testing method of I_0 ( annulation)/ I_0 ( aperture) for different obstruction ratio of double reflection optical system are described in this paper.

本文从夫朗禾费积分公式出发，论述了不同遮拦比的双反射光学系统I0（环）/I0（孔）的计算与测试方法，并通过计算和测量获得了有实用价值的数据。

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2、

A developmental model was put forward, which included adjusting the administrative area, cultivating a growth-pole by using the whole superiority, forming a economic union and promoting the economic development for inner ring to outer annulation.

据此提出调整行政区划和产业布局，集中优势培育增长极，建立区域经济联合体，实行圈层梯度推进的发展模式。

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3、

The efficient method is compatible with several functional groups. ( 4) Recent advance in transition-metal-catalyzed annulation of alkynes for the synthesis of naphthalene derivatives was summarized.

该方法具有高效、良好的官能团兼容性；（4）综述了近年来过渡金属催化炔烃环化反应合成萘衍生物的研究进展；然后在介绍了锌盐催化下萘的衍生物的合成。

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4、

Thus, in this dissertation three novel phosphine-catalyzed annulation reactions of electron-deficient conjugated systems have been systematically investigated, and the following results have been achieved. 1.

因此，本论文系统地探索了三类膦催化下缺电子共轭体系参与的新颖环化反应，并取得了以下结果。

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5、

Cantilever Racking: It is fit for long material, annulation, boards, and irregular goods.

悬臂式货架适用于放长物料，环形物料，板材和不规则物料。

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6、

Follow-up Measurement of Plastic Mitral Annulation with 2-DE and Color Doppler Ultrasound

人工二尖瓣环成形术后的二维与彩色多普勒超声随访检测

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7、

The Clinical Observation of Chinese Crude Drug Treatment by Stages on Menoxenia after Putting Annulation

中药分期治疗放环后月经不调的临床观察

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8、

On the Mixed Fundamental Problem in an Elastic Annulation

弹性圆环域的混合基本问题

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9、

An anomalistic month refers to successive returns to perigee, a period of 27.55455 days.

一个近点月指的是返回到近地点相继的时间，为27.55455天。

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10、

It is approximately the LCM (lowest common multiple) of the synodic period (29.53 days), draconic period (27.21 days), and the anomalistic period (27.55 days) of the Moon.

沙罗周期日数约为朔望月周期（29.53 日）、交点月周期（27.21 日）和近点月周期（27.55 日）的最小公倍数。

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11、

Peeling is an important annulet in potato processing, Methods of peeling which have been used at present all has their limitation.

马铃薯去皮是所有马铃薯制品加工工艺过程的重要环节，目前存在的各种去皮方法都各自有其一定的局限性。

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12、

Experimental Study of Flow and Heat Transfer of Narrow Annuli with Bilateral Heating

窄缝环形通道内单相液体传热和压降的实验研究

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13、

The Flow stability for Power& law Fluid Through Concentric Annuli

幂律流体在同心环形空间中流动的稳定性

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14、

A New Method for the Study of Fluid Flows in Eccentric Annuli

研究流体在偏心环空内流动的新方法

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15、

Power law fluid flow through eccentric annuli flow rate and pressure gradient

幂律流体在偏心环空中的流动&流量与压力梯度

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16、

Cancellation: Voiding a debt by annulling or paying it.

撤销，解除[债务]：以取消或偿付的办法使一笔债务失效

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17、

Their most ambitious plan was to annul the Bothwell marriage

他们野心勃勃打算废除和博思韦尔的婚约

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18、

The act of revoking or annulling or making void.

取消、废除或使无效的行为。

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19、

Effect on the Yield of Artemisia annul using Different Amount of Fertilizer of N, P, and P

不同氮磷钾用量对黄花蒿产量的影响

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20、

Annuls inappropriate decisions and orders of the people's government at the corresponding level;

撤销本级人民政府的不适当的决定和命令；

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