光学级紫外截止到400纳米，大于标准等级的光学纯度。
Optical grade with UV cut-off up to 400 nm, greater optical purity than standard grades.
弯管圆度应保证弯管上任何一点的外部直径不得大于标准直径的 2%。
The Out-of-roundness is not more than 2% of the outside diameter of the pipe at any point.
实验需要的间苯二酚-甲醛(RF)气凝胶的孔径大于标准RF气凝胶所形成的孔径。
The pore size of resorcinol formaldehyde aerogels (RF) in experiments is bigger than that of standard RF aerogels.
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