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《公约》规定，外销合同可以是口头或书面形式。
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两朵乌云是指“光速疑难”和“以太疑难”。
You might look unprofessional when you use emoticons and abbreviations.
CPS is the short form for Creative problem solving, a way of using your creativity to develop new ideas and solutions to problems.
A good thesis statement does two things. First, it tells readers an essay’s topic. Second, it presents the writer’s attitude, opinion, idea, or point about that topic.
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