厚度是最大截面上的最小尺寸。
Thickness is the minimum dimension of the heaviest section of the part.
弹簧覆盖率：床垫上所用弹簧的最大截面面积总和与床垫实测面积的百分比值。
Spring coverage: a spring mattress on the sum of the maximum cross-sectional area measured with the mattress area percentage.
为了揭示锈蚀钢筋力学性能退化现象的本质，用锈后钢筋的最大截面损失率来表征其力学性能的变化。
The maximum loss ratio of sectional area is used, instead of the loss ratio in weight, to express the mechanical properties of corroded reinforcement.
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