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【简答题】
To Friend or Not to Friend We all love our parents and turn to them when we're in need, but would you like them to hear the conversations you have with your friends on the school playground or lunch queue? Social networking sites have become extensions of the school hallways, so would you add your parents as “friends” and allow them to view your online activities and conversations with friends? In the past the generation gap included a technology gap, where children were up to date with latest technology and parents were left behind, content to continue their day to day lives as they always had because they had no need to know more about technology. However, more and more parents are beginning to realize just how important social networks are in their lives. This realization has given many parents the motivation to educate themselves about social networking sites. These days many people are attracted to social networking sites because they can choose who they have around them; there's also a certain amount of control over privacy that we don't get in real life. Sometimes we feel that privacy is violated when we must accept a “friend” request from a parent or family member. It's a difficult choice whether or not to allow a parent to become a part of our online lives. On the one hand we don't want to “reject” their request because that might hurt their feelings or make them feel you have something to hide. On the other hand if you do accept, then you could have a sense of being watched and no longer feel free to comment or communicate the way you did before. A recent survey suggested that parents shouldn't take it personally if their child ignores their request: “When a teen ignores a parent's friend request, it doesn't necessarily mean that they are hiding something, but it could mean that this is one part of their life where they want to be independent.” Perhaps talking with parents and giving explanations would help soften the blow if you do choose not to add them to your friends list. 小题1:From Paragraph 2, we learn that ________. A.parents feel secure about their privacy online B.social networks successfully fill the generation gap C.parents have realized the importance of social networks D.social networks offer a platform for parents to communicate 小题2:Teenagers may refuse a parent's friend request because ________. A.they hide something from their parents B.they are unwilling to be watched by parents C.their parents tend to fall behind in technology D.their parents make negative comments on them 小题3:The passage is mainly about ________. A.privacy online B.social networks C.the generation gap D.parents' friend requests 小题4:The passage is written mainly for ________. A.parents B.teenagers C.teachers D.researchers
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【判断题】两同频率的正弦电量的相位差与计时起点的选择无关。( )
A.
正确
B.
错误
【单选题】交流接触器的电磁机构主要由()、铁心和衔铁所组成。
A.
指示灯
B.
手柄
C.
电阻
D.
线圈
【单选题】交流接触器和直流接触器铁心的主要区别是( )
A.
交流接触器的铁心是由彼此绝缘的硅钢片叠压而成,而直流接触器的铁心不是
B.
直流接触器的铁心是由彼此绝缘的硅钢片叠压而成,而交流接触器的铁心不是
C.
交流接触器的铁心是由整块软钢制成,而直流接触器的铁心则不是
D.
交、直流接触器的铁心都是由整块软钢制成,但其大小和形状不同
【单选题】对两个同频率的正弦电压和电流的描述不正确的是( )
A.
同频率正弦量的相位差等于其初相之差,与时间无关
B.
相位差可以通过观察波形确定
C.
相位差与计时起点的选择有关
D.
正弦量的初相与正弦量参考方向的选择有关
【判断题】为了消除衔铁振动,交流接触器的铁心要装有短路环。
A.
正确
B.
错误
【单选题】对两个同频率的正弦电压和电流的描述不正确的是
A.
相位差与计时起点的选择有关
B.
同频率正弦量的相位差等于其初相之差,与时间无关
C.
相位差可以通过观察波形确定
D.
正弦量的初相与正弦量参考方向的选择有关
【判断题】( )旅游团队出境后因不可抗力或者其它特殊原因确需分团入境的,领队应当及时通知组团社,组团社应事先报经有关省级公安边防机关批准。
A.
正确
B.
错误
【简答题】交流接触器铁心上设有 是为了消除衔铁在铁心上的震动。
【判断题】交流接触器的衔铁和铁心均采用整块钢制作。
A.
正确
B.
错误
【多选题】下列描述正确的有:
A.
正弦量的初相位与计时起点的选择有关。
B.
正弦电流的幅值与有效值之间满足
C.
相位差可以用来描述两个正弦量的相对位置关系
D.
线性电路中,激励如果是正弦交流量,则响应也是同频率的正弦交流量。
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