查询词典 concave angle

Biconcave:Concave on both sides or surfaces.

两面凹的：两侧或两面凹陷的。

Concave on both surfaces; biconcave.

双面均凹进的；双凹的。

This article outlines the progress of ancient Chinese lenses from the Pre-Qin Period to the Five Dynasties, and discusses mainly two arguments: First, the"yangsui" recorded and narrated in Lun Heng by Wang Chong of Eastern Han Dynasty may be a plano-convex glass lens; secondly, the"four mirrors" recorded and narrated in Tanzi Hua Shu by Tan Qiao of Southern Tang Dynasty may be a plano-convex lens, a biconvex lens, a transparent planeparallel plate and a concave-convex lens respectively, but what kind of tra...

本文概述了中国古代透镜从先秦到五代的发展进程，着重从古代文献和出土文物的研究出发，结合中国古代社会经济发展水平，论证了东汉王充《论衡》中记述的阳燧可能是玻璃平凸透镜；论证了南唐谭峭的《谭子化书》中记述的"四镜"可能是平凸透镜、双凸透镜、平光镜和凹凸透镜。作者认为《谭子化书》"四镜"段可能实际上是对中国古代透镜发展的阶段性总结。

According to the comparative research on Guangnania, the diagnosis of the zosterophytes is expanded. It is suggested that their sporangia have the differentiation in the shape (reniform, rounded/globose to vertically elongate), dehiscence and valves (biconvex or concave/convex).

根据Guangnania的研究和对比，对工蕨类植物的特征进行了扩展，认为孢子囊存在形状（肾形—圆形／球形—纵向伸长）、开裂方式和两瓣的分异。2。

Broken-rollers and stepless blad type double facer adopts combined structure which effectively overcometraditional low heat efficeency because of concave heat box when work,which improve work speed and qualit,decrease wasted board,especially suitable for light weight board.

其中碎辊式无级压载双面机采用碎辊结构，有效克服传统压载，因加热箱工作时下凹，导致热板上表面传热效率差的缺点，避免了传统压辊不平衡对纸板的冲击，从而提高了生产速度和质量，降低了废品率，更加适合克重纸板生产。

Perianth segments free, proximally becoming leathery and adaxially concave in fruit; anther appendage thick, not inflated and bladderlike, with 3 teeth.

花被片离生，在果期接近变得似皮革和正面凹；花药附属物厚，不膨大和囊状，具3齿。 42 Petrosimonia 叉毛蓬属

Is the iron box is concave body parts and hard surface contact resulting in the mobile hard drive not working properly?

难道是内凹的铁质盒身与硬盘表面部件有接触致使移动硬盘工作不正常？

With morphology characteristics of erosion concave of Ag and Pd contact materials in nitrogen and air being compared, influence on erosion, welding and breakdown voltage of contact for nitrogen and SF_6 being analyzed, influence on contact for the formic acid, toluene, carbinol and distilled water being analyzed, it was showed that the influence on performance parameters of relay contact for various atmospheres is very com...

通过比较触头材料Ag和Pd分别在氮气和空气中侵蚀凹坑的形状特征，分析了氮气和SF6等气氛对触头侵蚀、熔焊、耐压的影响，及甲酸、甲苯、甲醇、蒸馏水等对触头的影响，表明各种气氛对继电器触头性能参数的影响十分复杂，该影响涉及对电弧运动规律的影响和与材料的化学反应。

Seed face plane to concave; endocarp woody. Carpophore usually absent.

种子表面平到凹；内果皮木质；果瓣柄通常缺席。

For testing the concave ellipsoidal mirror of Three Mirror Cassegrain optical system, a slab compensated auto-collimation method is suggested.

针对TMC光学系统凹椭球面主镜的检验，本文提出了一种平板补偿的自准检验方法。

Aquatic or marsh-growing fern allies; known to have existed since the Cenozoic; sometimes included in Lycopodiales.

生活于水中或湿地的蕨类；从新生代生存至今；有时归于石松目之中。

The engine was uprated from a 90hp Franklin to a 125hp Lycoming.

改良过的引擎是从90hp到125hp莱康明富兰克林。