For the mechanicalefficiency of gold is, per se its ratio to the credit built on it.
因为从根本上来说,黄金的力学效率取决于黄金与以黄金为基础的信贷之间的比例。
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W: We ask for full payment at sight, because we guarantee 90% mechanicalefficiency for all our products. You don't have the same guarantee from other suppliers. The usual percentage is around 85.