The solution of the projection on inward concave composition surface of cylinder and cone is discussed. and the critical point on the projection is calculated with analytical method.

本文着重介绍内凹的圆柱和圆锥组合面上落影的求法，并尝试利用解析的方法，求出落影上的特殊点。

youdao

Tender thin woollen fabrics, feel comfortable, including 48% wool composition, surface and slightly bright silk, low-key costly, top-grade quality.

温软的薄毛呢面料，手感舒适，含48%羊毛成分，表面还有微微亮丝，低调奢华，高档品质。

youdao

The composition, surface morphology and phase structure of the films were tested by EDXA, FSEM, AFM and XRD, respectively.

并通过EDXA、FSEM、AFM和XRD等手段，检测薄膜的成分、表面截面形貌和相结构。

youdao

We've learned how to identify and catalog cells according to the composition of proteins on the surface and those proteins that distinguish a cell are often called marker proteins.

我们学会了如何按照表面的蛋白成分,来识别并分类细胞,而这些用来区别细胞的蛋白,通常称为标记蛋白

耶鲁公开课 - 生物医学工程探索课程节选

Since cosmic radiation alters surface composition, Curiosity can drill into rock to extract pristine material from below.

CNN: Curiosity opening Martian frontier?

Observations of the material coating the dark face of Iapetus indicate it has a similar composition to the surface material on Phoebe.

BBC: New ring detected around Saturn

Phase II, planned for 2011, will identify both aquifers down to 3, 000 meters below the surface, study soil composition and aquifer replenishment, and prioritize areas for agricultural development.

UNESCO: launches initiative to identify groundwater and alleviate water shortages in Iraq | United Nations Educational, Scientific and Cultural Organization