1.选择题It is not surprising, then, that the world saw a return to a floating exchange rate system. Central banks were no longer required to support their own currencies.在这种情况下，世界各国又恢复浮动汇率就不足为奇了。各国中央银行也就无须维持本币的汇价了。Assuming the laboratory tests go well, and you can quote us a competitive price, we would certainly be able to place more substantial orders on a regular basis.若实验室检验合格，且你们给我们的报价具有竞争力，我们一定会定期大量订货的。 Chinese researchers have made a breakthrough in developing new materials for nickel-h
