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球形AED小于5μm的粉尘离子可以达到呼吸道深部和肺泡区，称为（）。
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writelines()方法用于向文件中写入字符串，换行需要使用换行符（）。
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The ability to do several things at once has become one of the great measures of self-worth for 21st -century Americans. It is called multitasking, and it takes many forms. As one example, why go out to lunch when you can eat at your desk, talk to a client on the phone, scroll through your e-mail, and scan a memo simultaneously? And why simply work out on treadmill(单调的工作)when you could be watching television and talking on a portable phone at the same time? What a feeling of satisfaction and accomplishment—three activities for the time commitment of one! Ah, such efficiency. No wonder those who turn 'to do' lists into a time-management art form. are inclined to boast, 'Look, me, how many things I can accomplish at once. If I'm this busy, I must be important. ' Yet last week the New York Assembly struck a blow against multitasking, at least behind the wheel, when it approved a bill banning drivers in the state from using handheld cellular phones. Too dangerous, the assembly said, citing research showing that drivers are four times more likely to have a collision when they are talking on a cellphone. No one can argue against using time effectively. But accompanying the supposed gains are losses. Consider the woman out for an early-morning walk in a suburban neighborhood. She strides briskly. Head down, cellphone clamped to her ear, chattering (喋喋不休) away, oblivious of the birds and flower and glorious sunshine. Did the walk have any value? More than a decade ago, long before multitasking became a word in everyday use, a retired professor of theology in Indiana with whom I corresponded made a case for what might be called uni-tasking—the old-fashioned practice of doing one thing at a time. Offering the simplest example, he said, 'When you wash the dishes, wash the dishes. ' Good advice, I've found, whatever the task. Perhaps, too, the ban on phoning on the road will even spark a move away form. other forms of dual activity. Who can tell? It could mark the first step in a welcome reconsideration of what really constitutes productivity and accomplishment.The author thinks that multitasking has become one of the great measures of self-worth because______.A．it helps people to use time effectivelyB．it makes people feel they are importantC．it means the ability to do several things at onceD．people worship speed and desire
A.B.C.TheD.A．itE.itF.itG.people
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患者，男性，20岁，持续发热半个月，体温37～40℃，晚上为甚，早晨正常，伴畏寒，无寒战，间有腹痛，大便稀，2～3/d，无脓血，精神、食欲尚可。查：肝剑突下4cm，轻触痛，脾侧位可触及。血象：Hb 120g/L，WBC 18×109/L，N 0.50，L 0.30，E 0.20。该病例诊断可能性最大的是
A．急性血吸虫病
B．结核
C．伤寒
D．肝脓肿
E．病毒性肝炎
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在致畸试验中，活胎检测内容不包括（）
A.外观畸形检查
B.组织病理学检查
C.内脏畸形检查
D.体重测量
E.骨骼畸形检查
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对（）容量的正确预测不论在产品刚上市还是产品需要重新定位时都具有参考价值。
A.潜在市场B.有效市场C.目标市场D.渗透市场
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水的主要功能是维持微生物细胞的膨压和作为生化反应的溶剂。
A . 正确
B . 错误
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房地产估价的原则中，（）要求估价结果是在根据估价目的确定的某一特定时间的价值或价格。
A . 替代原则
B . 合法原则
C . 价值时点原则
D . 最高最佳利用原则
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通过财产清查，可以（）
A.查明财产物资和货币资金的保管使用情况B.查明往来款项的结算情况C.监督作用D.查明账实不一的原因E.保证会计核算资料的正确性和真实性
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视平线在绘画时指的是()。
A、画面上的任一水平线
B、画面上的任一垂线
C、画面上的底边线
D、画面上过主点与绘画者眼睛同高度的水平线
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医疗保险组织机构的职能是（）。
A.参与制定医保法规政策
B.管理医保资金
C.支付参保人医疗费用
D.监控参保人和医疗服务提供者行为
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保险业金融机构对可疑类客户应采取哪些风险控制措施（）
A.与可疑类客户建立业务关系时，应当采取标准型尽职调查措施识别客户身份，并按照本机构特定的业务处理程序进行处理。 B.在可疑客户的业务关系续存期间，应当全面了解客户的信息，加强监控其日常各项交易情况和错作行为 C.对于可疑类客户，应当对其身份信息及资金状况进行审核，审核频率应高于关注类客户，并根据结果调整客户洗钱分类等级 D.可疑类客户及其金融交易活动如在风险等级评定周期内再次出现可疑交易，应持续进行报告
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The ping loopback hangs with no output.Which of the following is the most likely cause?（）
A.The loopback interface is down and resolv.conf is configured. B.The loopback is not in /etc/hosts and resolv.conf is configured. C.The loopback interface is down and resolv.conf is not configured. D.The loopback is not in /etc/hosts and resolv.conf is not configured.
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