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.

1、

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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2、

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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3、

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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4、

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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5、

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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6、

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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7、

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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8、

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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9、

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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10、

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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11、

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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12、

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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13、

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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14、

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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15、

The act of revoking or annulling or making void.

取消、废除或使无效的行为。

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16、

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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17、

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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18、

Analysis of Measuring Results of Annul Total Expenditure on Health by the Method of Health Financing Re-source

安徽省卫生总费用筹资来源测算结果分析

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19、

Under prevailing law, the government cannot annul such marriages.

按现行法律，政府无权宣布这类婚姻无效。

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20、

Distribution of annul largest magnitudes of earthquakes and confidence limit research

年最大地震震级分布置信限曲线和置信度研究

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