背孔

底镜沉积于EPW腐蚀液腐蚀形成的背孔内，在1.2～1.5μm范围内，反射率高达99%。

Reflectivity spectrum indicates that the mirror deposited in the hole has a reflectivity as high as 99 % in the range of 1.2 ~ 1.5 μ m.

一种新的机械自紧理论及光塑性数字散斑相关方法背孔属（Notocotylus）一新种的描述[吸虫纲：背孔科（Notocotylidae）]

A New Approach of Mechanical Autofrettage Theory and Photoplasticity Digital Speckle Correlation A NEW SPECIES OF NOTOCOTYLUS FROM CANTON ( TREMATODA : NOTOCOTYLIDAE )

身体前几个节间沟内经常无背孔。

There are usually no dorsal pores in the first few intersegmental grooves .

扫描电镜观察表明，孵化第32&36天的胚胎背部第二行鳞的各列鳞片表面均有背腺腺孔，以后逐渐出现少数不规则的退化，孵化第58天以后，绝大多数背腺腺孔消失。

Observation under scanning electron microscope revealed that there were dorsal gland holes on surface of every dorsal scale in the second row of earlier embryos , and afterwards , a few of gland holes degenerated gradually in an irregular way .

该天线满足电讯设计需求，且避免采用接地板背腔开工艺孔的方法。

The antenna can meet the microwave design and avoid the drilling holes in ground plate .