Such levels previously have been reported only for photo diodes manufactured with special processes that use back-side illumination, or for discrete UV photo diodes.
如此高的水平以前仅被用于使用背面照明，或离散u V光二极管特殊工艺制造的光电二极管的报道。
Frequently it has a hinged glass cover to hold copy flat, and may have a removable section in which a transparency holder can be positioned for back-lighting illumination.
一般都备有铰链着的玻璃盖面，以把稿件夹平。有些更可以换上透明片架，在后面打灯照明。
Frequently it has a hinged glass cover to hold copy flat, and may have a removable section in which a transparency holder can be positioned for back-lighting illumination.
一般都备有铰链着的玻璃盖面，以把稿件夹平。有些更可以换上透明片架，在后面打灯照明。
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