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Construction
containing
等级的
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商业等级铝
commercial grades aluminium
应力等级
stress grading
木材应力等级
timber stress grading
波特兰水泥等级
Portland cement grades
等差等比级数
arithmetic-geometric series
等级网格
graded nets
配合〔可靠性〕等级
grade of fit
黑白亮度〔半色调〕等级
tones of grey
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