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No one from your company will be able to go with us _our frrst trip to London.[ANo one from your company will be able to go with us _our frrst trip to London. [A]on [B]for [C]in [D]at

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We have learned from our Embassy that you are interested in importing Chinese silk productWe have learned from our Embassy that you are interested in importing Chinese silk products. We are a long-established exporter of silk products in China and we have a very good reputation both at home and abroad. Our products sell well all over the world and are highly valued by our customers for their excellent quality and fine workmanship （）. Enclosed are our catalogue and price list covering all the products. We are looking forward to your early reply.

正弦交流电的三要素是：频率、最大值、初相角。正弦交流电的三要素是：频率、最大值、初相角。

Sweet and sour pork fillet is a famous dish of Su cuisine.（）

When a two-input NAND gate has inputs of 1 and 0, the output is 0.（）