The rate of top grade field developing by camera bellows was up to 90%, with less poor quality and no waste photos.
暗箱在拍片现场成像优质率达90 %，质差片减少，无废片。
A new field is opened up to improve the grade of the paint used specially for internal combustion engine in our country.
为提高我国内燃机漆的档次开辟了新的领域。
A new field is opened up to improve the grade of the paint used specially for internal combustion engine in our country.
为提高我国内燃机漆的档次开辟了新的领域。
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