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Market research{{/B}} Market research has become more and more important in recent years. In some organisations, in fact, managers will not initiate any activity without market research to back. them up. The first thing to be said about market research is that it is not an{{U}} (21) {{/U}}to management decision-making. No form of market research, no matter how deep, complicated and detailed, can ever be seen as a substitute for creative decision-making by professional managers{{U}} (22) {{/U}}its very best, all it can do is{{U}} (23) {{/U}}some doubt and clarify the nature A. For B. From C. At D. With [单选题]填料函保持零泄漏或正常滴漏在( )滴/分范围内，无发热冒烟现象。
A.5～10 B.10～20 C.10～30 D.20～40 [单选题]客车编入货物列车回送时，客车编挂辆数不得超过（ ）。
A.A、10辆 B.B、20辆 C.C、3辆 D.D、1辆 [单选题]两个及以上承包商在同一作业区域内进行施工作业,可能危及对方生产安全的,在施工开始前建设单位应当组织区域内承包商互相签订安全生产(HSE)合同。
A.对 B.错 [单选题]綴学打工虽然可以赚到第一桶金，但缺少了读书求学的 和校园生活的 ,你的青春风景会大打折扣,人生又会回到老路。
填人划横线部分最恰当的一项是（）。
A.经历陶冶 B.锻炼培养 C.历练熏陶 D.经验回忆 [判断题]一国对贸易商品的供求弹性越大，供求曲线越陡峭，该国从建立关税同盟中获得的贸易创造利益就越大。
[单选题]无缝线路地段道床应采用一级碎石道砟，道床清洁、密实、均匀。跨区间无缝线路道岔范围内道床肩宽（ ）。
A.450mm B.500mm C.550mm D.600mm [单选题]防护分歧道岔的线路所通过信号机显示（ ）时，不准列车越过。
A.绿色灯光 B.黄色灯光 C.白色灯光 D.红色灯光 [填空题]防火巡查执行情况各部门（ ），总部安全技术部至少（ ）。
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