The maintainability of a product has a direct influence on the product properties in the use stage, even the recycling and remanufacturing of the product.
产品的可维修性直接影响到产品的使用性能，甚至产品的回收再制造。
Note 2: the properties and rules for the use of indented bars with precast concrete products may be found in the relevant product standard.
注2：与预制混凝土产品一起使用的刻痕钢筋的性能和规定在相关的产品标准中可以查到。
The properties of Bell number in proper order are studied with the use of elementary method, some identities involving the sum of product of Bell number in proper order are obtained.
利用初等方法研究了有序贝尔数的性质，给出了关于有序贝尔数的一组恒等式。
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