要在word中编辑数学公式，必须要安装office的公式编辑器组件（）
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The terms of payment we wish to adopt are confirmed and irrevocable letter of credit.
将Word文档的大纲加入PowerPoint，可将Word文档另存为ppt格式。（）
The present crisis bears some ________（similar） to the oil erisis of the 1970s
Our most ________（success）product is based on a very simple idea
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