The abrasion-resistant and rustproof sleeve is the only part exposed to the chain and the process, which results in a long service life minimal maintenance requirements.
这种耐研磨和不生锈套管是阀门中唯一与锚链接触的部件，因此阀门的使用寿命就更长，对维护的需求也更少。
2
In chapter two, the minimal energy graph for fully angular hexagonal chains is helical hexagonal chain.
在第二章中，得到了全角六角链的极小能量图是螺旋链。
3
In this paper we discussed the problem of collaboration-supply in supply chain based on minimal total cost including transportation cost, purchase cost and inventory cost.