diameter造句

Spot diameters of just a few thousands of an inch can readily be attained with convenient short focal length lenses .
用普通的短焦距透镜不难得到直径只有几十微米的光点。
The metering rod either has two or more steps of different diameters or is tapered at its lower end .
量油杆可以有两个或更多个不同直径的台阶，或在它的下端被逐渐削成锥形。
The oil-immersion objectives just described admit a wider cone of rays than a dry objective of the same diameter would .
刚才描述的油浸物镜与直径相同的干物镜相比，可容纳更宽的光线锥。
It's difficult to find diameter in a sentence. 用diameter造句挺难的

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