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企业销售交易中涉及的主要凭证有（）。
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用Ø50的插入式振捣器（帮长约500mm）振捣混凝土时，混凝土每层的浇筑厚度最多不得超过（）
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Dialogue : Beautiful Packing John: Glad to see you again, Sherman. Sherman: Hi, glad to see you too. John: Please, sit down．Would you like to try our new tea? Sherman: Great! The main purpose of my visit today is to place another order of your Longjing tea．Actually, we will place regular orders from now. John: Oh, it is a good news for us．I have the confidence that our tea won't make you disappointed. Sherman: That is true．But before that, I'd like to talk something about the packing of Longjing tea. John: Did you find any problems with the packing? Sherman: No．My meaning is to improve the packing of your Longjing tea．There is no doubt that the quality of your tea is good．It is the packing that often gives the first impression on customers rather than the products themselves so we believe the packing is as important as the quality of the products themselves. John: I agree with you．But could you be in details? Sherman: Sure．Firstly, we believe the out-look of the package should attract customer．A beautiful packing is surely a great help in pushing sales．To be honest, your packing is not attractive enough to buyers. John: Do you mean the color of the design should be more bright and eye-catching7 Sherman: Eye-catching with traditional Chinese style．You see, customers even can smell your culture before they open the box and drink the tea．As you know, one function of packing is to stimulate the buyer's desire to buy. John: I'll pass your idea onto our designers and ask them to improve it. Sherman: Thank you John．Secondly, if it is possible, we would like to advise you to improve your methods of packing. John: Our packing is typical tin for tea．Any questions about this method of packing? Sherman: I am thinking about how to let your packing speak for the good quality of the tea itself．Can we find some other packing ways to show off the appealing green and sl~ape of the tea? John: We can leave an open window on packing. Sherman: You get the point. John: Thanks for your suggestion.
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引起兴奋的刺激条件有()。A、刺激强度B、变化速率C、刺激频度D、刺激作用时间
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在强光下拍摄，应选择被摄体（）的部位，仍可见层次的地方测光，所得光值应加上22/3格EV值。
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运算结束后，ZF=0，表示()A.运算结果为正数B.运算结果为负数C.运算结果不为零D.运算结果为零
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油品蒸发损耗按照（）可分为自然通风损耗、小呼吸损耗、大呼吸损耗等。
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排卵控制概念。
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一般项目中对不影响安全和使用功能的少数条文的要求是（）。
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接待用语既代表着出版物发行员个人的修养、知识水平，也代表着发行单位的（）。