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题目：
未知类型
A.职能分工的要求
B.部门划分的需要
C.权责明确的需要
D.管理幅度的限制
答案：
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根据煤层顶板变形和垮落的难易程度，一般可将煤层的顶板分为（）种。
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由于阴和阳是相互制约的，阴阳偏胜必然导致____和____。
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零税率应税服务提供者在申报办理零税率应税服务免抵退税后，应向主管税务机关办理出口退（免）税认定。
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信息系统电源线路采用多级SPD防护的主要目的是（）
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科研人员提高道德修养的根本途径是（）。
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药品生产企业不得委托其他药品生产企业生产的是（）
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for, too high, meet, meet with, disappointed, at, onDear Sir or Madam, Thank you(1)your mail．We are(2)to hear that our price for your required product is(3)for your acceptance．You mentioned that Japanese goods are being offered to you(4)a price approximately 8% lower than our quotation. We accept your position, but we are of the opinion that the quality of the other makes does not measure up to that of our products．Although we are keen to do business with you, we regret that we cannot accept your counter offer. We do want to try and work with you, and meet your request, but the best we can do is to reduce our previous quotation by 3%．We hope that this will(5)your approval. We look forward to hearing from you. With best regards,
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当锅炉轻微缺水时，待水位上到最低安全水位线以上后，再（）。
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粉丝（vermnicelli）
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GSS是APT的核心，其主要硬件设备有（）。