两种相依变化的量，如果它们相对应的两个数的比值一定，这两种量就叫做成正比例的量，它们的关系叫做正比例关系。 y=kx(k不等于0)
热取样氧化铁皮厚度与热轧板厚度成正比例关系。
And, the thickness of hot sample scale is directly proportional to that of HR sheet.
结果表明，极限抗压强度与负温和应变率的对数均呈正比例关系；
Test results show that the ultimate compressive strength of the polycrystalline ice is directly proportional to the temperature and also to the logarithm of strain rate.
一个人对法律和秩序的尊重程度和他薪水的多少成精确的正比例关系。
A man's respect for law and order exists in precise relationship to the size of his paycheck.
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