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题目：
单选题
A一定是领先的；
B一定是落后的；
C可能是领先的，也可能是落后的；
D是不变的。
答案：
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下列关于船舶载运危险货物的船舶停泊值班，说法错误的是：（）
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镜板多为（）锻钢制成。
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关于肿瘤间质的描述正确的是（）
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普通，中级和高级抹灰层相同的是（）。
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动产物权一般以()为证明。
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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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清醒的低温病人复温时，下列最不常出现的是（）
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生川乌药材中含有的剧毒成分是（）
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地球的表面积约为510000000平方千米，改写成以“亿”做单位是（）亿平方千米。
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塑料绝缘导线为什么严禁直接埋在墙内