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Twenty years ago, kids in school had never even heard of the internet. Now, I ’ ll bet you can ’ t find a single person in your school who hasn ’ t at least heard of it. In fact, many of us use it on a regular basis and even have access to it from our homes! The ‘ net ’ in internet really stands for network. A network is two or more computers connected together so that information can be shared, or sent from one computer to another. The internet is a vast resource for all types of information. You may enjoy using it to do research for a school project, downloading your favorite songs or communicating with friends and family. Information is accessed through web pages that companies, organizations and individuals create and post. It ’ s kind of like a giant bulletin board that the whole world uses! But since anyone can put anything on the internet, you also have to be careful and use your best judgment and a little common sense. Just because you read something on a piece of paper someone sticks on a bulletin board doesn ’ t mean it is good information, or even correct, for that matter. So you have to be sure that whoever posted the information knows what they ’ re talking about, especially if you ’ re doing research! But what if you ’ re just emailing people? You still have to be very careful. If you ’ ve never met the person that you ’ re communicating with online, you could be on dangerous ground! You should never give out any personal information to someone you don ’ t know, not even your name! And just like you can ’ t believe the information on every website out there, you can ’ t rely on what strangers you ‘ meet ’ on the internet tell you either. Just like you could make up things about yourself to tell someone, someone else could do the same to you!
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【简答题】● 机房隐蔽工程中,空调上下水管材质最合适使用 (17) ;当隐蔽的电缆槽道与屋内无保温层的热力管道交叉时,其最小净距一般是 (18) 。 (17) A. 铜管 B. 不锈钢管 C. PVC管 D. 水泥管 (18) A. 0.3m B. 0.4m C. 0.5m D. 1m
【单选题】对资产负债表的分析实质就是对企业在某一特定日期( )进行分析。
A.
财务状况
B.
经营成果
C.
现金流量
D.
所有者权益的变化
【单选题】锚设备的制链器,它的作用是
A.
避免锚链跳动
B.
减轻锚机负荷
C.
减轻锚链下垂曲度
【单选题】下列不属于隐蔽工程的是
A.
墙体拆建
B.
水路施工
C.
电力施工
D.
外墙装饰
【单选题】机房隐蔽工程中,空调上下水管材质最合适使用 (17) ;当隐蔽的电缆槽道与屋内无保温层的热力管道交叉时,其最小净距一般是 (18) 。 (17)
A.
铜管
B.
不锈钢管
C.
PVC管
D.
水泥管
【单选题】下列不属于隐蔽工程的是( )工程。
A.
跑道灯光供电电缆敷设
B.
水泥稳定碎石基层施工
C.
下滑信标台接地装置安装
D.
标记牌安装
【单选题】对资产负债表的分析,实质就是对企业在某一特定期( )进行分析。
A.
财务状况
B.
经营成果
C.
现金流量
D.
所有者权益的变化
【单选题】锚设备的制链器,它的作用是_。
A.
避免锚链跳动
B.
减轻锚机负荷
C.
减轻锚链下垂曲度
D.
三者都对
【单选题】对资产负债表的分析,实质是分析企业在某一特定日期的
A.
财务状况
B.
经营成果
C.
现金流量
D.
所有者权益的变化
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A.
含有-NHCONH-结构
B.
含有苯基
C.
含有羰基
D.
含有内酰胺结构
E.
含有-CONHCONHCO-结构
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