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In the future your automobile(汽车) will run on water instead of gas! You will be able to buy a supercomputer that fits in your pocket! You might even drive a flying car! For each prediction that has come true today, several others have missed by a mile. Many of these predictions didn’t consider how people would want to use the technology, or if people really needed it in their lives or not. Let’s look at some predictions from the not-too-distant past. Robot Helpers Where’s the robot in my kitchen? Nowhere, of course. And he’s probably not coming anytime soon. Robots do exist today, but mostly in factories and other manufacturing environments. Back in the 1950s, however, people said that by now personal robots would be in most people’s homes. So why hasn’t it happened?  Probably because robots are still too expensive and clumsy. And maybe the idea of robots cooking our dinners and washing our clothes is just too weird . At home we seem to be doing fine without them. Telephones of Tomorrow In 1964 an American company introduced the video telephone. They said by the year 2000 most people would have a video phone in their homes. But of course the idea hasn’t caught on yet. Why? The technol ogy worked fine, but it over—looked something obvious: people’s desire for privacy(隐私). Would you want to have a video phone conversation with someone after you just step out of the shower(淋浴)?  Probably not---it could be embarrassing! Just because a technology available doesn’t always mean people will want to use it. And finally, how about that crazy pre diction of the flying car? It’s not so crazy anymore! But a flying car remains one of the most fascinating technology ideas to capture our imagination. Keep watching the news, or perhaps the sky outside your window, to see what the future will bring. 小题1: The whole passage is mainly about ________________. A.predictions that have come true. B.predictions that haven’t come true. C.why predictions don’t come true easily. D.what technology will bring about. 小题2: The author of this passage won’t believe that _________________. A.predictions needn’t consider people’s practical use of technology. B.the future isn’t always easy to guess. C.not all past predictions have come true. D.many of the high—tech things our parents thought we’d be using by now simply never appeared. 小题3: The underlined word “weird” probably means __________. A.wonderful B.stupid C.practical D.strange 小题4: What does the author think of the flying car? A.It is too difficult to imagine. B.It is too crazy an idea. C.It is likely to be made. D.It is often reported in the news.
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【多选题】DHCP服务器分配给客户端的动态IP地址通常有一定的租借期限,关于租借期限的描述正确的是()。
A.
租期更新定时器为总租期的50%,当“租期更新定时器”到期时,DHCP客户端必须进行IP地址的更新
B.
重绑定定时器为总租期的87.5%
C.
若“重绑定定时器”到期,客户端还没有收到服务器的响应,会一直发送DHCPREQUEST报文给之前分配过IP地址的DHCP服务器直到总租期到期
D.
在租借期限内,如果客户端收到的都是DHCPNAK报文,那么就返回到初始化状态。此时客户端必须立即停止使用此IP地址,并且返回到初始化状态,重新申请新的IP地址
【单选题】退出当前应用程序的方法是( )。
A.
按 Esc 键
B.
按 Ctrl+Esc 键
C.
按 Ctrl+F4键
D.
按 Alt+F4 键
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【单选题】使难溶电解质的沉淀溶解,不能采用的方法有( )
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生成弱电解质
B.
转化为另外一种沉淀
C.
生成配合物
D.
发生氧化还原反应
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【多选题】DHCP 服务器分配给客户端的动态 IP 地址通常有一定的租借期限,关于租借期限的描述 正确的是
A.
租期更新定时器为总租期的 50% ,当“租期更新定时器”到期时, DHCP 客户端必须进行 IP 地址的更新。
B.
B 重绑定定时器为总租期的 87.5 %
C.
若“重绑定定时器”到期,客户端还没有收到服务器的响应,会一直发送 DHCP REQUEST 报 文给之前分 配过 IP 地址的 DHCP 服务器直到总租期到期
D.
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【多选题】GQPS-969计算普通算术平均数,必须知道( )等测量信息。
A.
被测试群体分数的总和
B.
被测试群体的总人数
C.
补测试群体的男女比例
D.
测试题目的数量
E.
被测试群体的最高分和最低分
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A.
客户端以广播方式发送DHCP DISCOVER 报文,DHCP 服务器会进行响应。
B.
客户端只需要广播包含上次分配IP 地址的DHCP REQUEST 报文即可,不需要再次发送DHCP DISCOVER 报文。
C.
DHCP 服务器收到DHCP DISCOVER 报文后,向该客户端发送包含出租IP 地址和其它设置的DHCP OFFER 报文。
D.
DHCP 服务器收到DHCP REQUEST 报文后,如果客户端申请的地址没有被分配,则返回DHCP ACK确认报文。
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