透镜望远镜,或称折射望远镜,在人们能够制造出高质量的火石玻璃透镜以后得到了很大的改进。
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广布的加积沉积旋回、经常被鲕滩,潮坪或萨勃哈蒸发岩层所覆盖。4.Oolitic hematite is considered as one of the most refractory iron ore type.鲕状赤铁矿石是目前国内外公认的最难选的铁矿石类型之一。
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a corner cube is adopted to act as a refractor, forming a folding optical resonant cavity;
此激光器采用角隅棱镜作折光器构成折叠式光学谐振腔。
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The refractor is light weight, portable and can be used for either visual or CCD imaging.
该折射的是重量轻, 携带,可用于无论视觉或ccd成像.
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A three-inch refractor will give an excellent view as well as showing Titan.
一架三英寸的折射望远镜就能看到极好的景象,还可以看出土卫六.
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