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在通道面板上按住什么功能键可以加选或减选：
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B. ctrl
C. tab
D. shift
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推荐知识点:
Advertising to Children （1） Not only are they easily swayed by advertising， they are also persuasive in encouraging their parents to buy a product. If a child wants something in their kid's locker， they will prod and annoy their parents until they get what they want.（2）All it takes is a little suggestion from a single advertisement to send them on their way. （3） In a campaign entitled "Kids are the Star"， its employees were encouraged to pay special attention to children and to make sure they had a positive experience while eating at its restaurants. The reason for this， naturally， was not that the McDonald's corporation cared deeply about the well-being of children everywhere， but that the pester-power that children have is extraordinarily effective at bringing their parents back for more visits. The way that advertisers target children is simple big， bright lights， happy people and animated characters are all that is needed to encourage children to think a certain product is something they want. （4）They do not realize that Ronald McDonald is just a guy in a Costum and make-up， and that behind the counter of every McDonald's is a bunch of kids working in uncomfortable conditions for low pay. This poses a real moral dilemma for those who make the advertising decisions， or at least it should. （5）How do you say no to an opportunity to reach such a wide audience of children， who act as advertisers themselves when they encourage other children and their parents to buy a particular product？ 4.（）
失重
我们现在“恭敬”连用，古代“恭”、“敬”二者的关系应该是（）。
男性，40岁，体检发现空腹血糖6．4mmol／L，此病人应首选下面哪项检查确诊（）
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吗啡引起呼吸抑制的原因是抑制呼吸肌功能。()
强心苷对心肌电生理特性的影响正确的是 A．降低窦房结自律性 B．加快传导 C．延长有效不应期 D．窦房结自律性增加 E．减慢心率
安装清单项目中不形成实体，但是作为安装工程不可缺的一个内容设工程量清单编码的是：（）.