To replace the old silver coin , a new silverless dollar was minted in november of 1971 代替老式银币流通的是于1971年11月铸造的不含银的新硬币。
For the purpose of combination of the antimicrobial effect of the silver ion with the high absorption properties of the alginate fibers , silver ions can be added into the alginate fibers to prepare silver - contained alginate fiber and wound dressing 摘要为了结合银的抗菌性能和海藻酸纤维的高吸湿性,可将银离子加入海藻酸纤维后制备含银的海藻酸纤维和医用敷料。