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【简答题】
We all know the dangers of fires. It’s good and necessary for a family to learn how to prepare for a fire. Here are some suggestions. Put a smoke alarm(火警) in the house. Smoke from a fire causes the alarm to go off. The alarm makes a loud sound. The sound tells everyone to leave the house at once. Make escape plans. We should know all the ways out of the house. If there is a fire, everyone follows the plan to get out. Part of the plan is to check all the windows to make sure they can be opened easily. Buy fire extinguishers(灭火器) in the house. Everyone in the family should know how to use them. Practise for a fire. We do fire practice because we teach children about fire safety. Everyone in the family should know the following fire rules: ★Don’t open a hot door! The fire can grow more quickly if you open the door. ★Stay close to the floor! Smoke can be more dangerous than fire. The best air is near the floor because smoke rises. ★What will you do if your hair or clothes start to burn? First, stop! Don’t run! The fire burns faster because of more air. Drop! Fall to the floor. Then roll! Turning over and over will make the fire go out. Put a blanket(毯子) around you to keep air away from the fire that may still be on you. There are many possible causes for fires. A wise family is ready all the time. If there is a fire, don’t forget to call 119 for help. 小题1:When a smoke alarm rings at home, it means _________. A.you have to get up B.water is running to the floor C.something is burning D.someone breaks your window 小题2:The writer advises us to do the following to prepare for a fire except that _____. A.we practise for a fire B.we make escape plans C.we buy fire extinguishers D.we use electrical cookers 小题3:When a fire happens,____ if you open the hot door. A.the door will soon be on fire B.the electricity will be cut off C.the fire will grow more quickly D.the house will fall down 小题4:What are the right steps you should take when your hair or clothes catch fire? A.Stop, run, roll. B.Stop, drop, roll. C.Run, drop, roll. D.Roll, drop, stop. 小题5:What is the best title for this passage? A.Be Ready for a Fire. B.The Causes of a Fire. C.Learn to Use a Fire Extinguisher. D.The Dangers of a Fire.
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【单选题】GPON将业务带宽分配方式分成4种类型,优先级从高到低分别是()
A.
固定带宽、保证带宽、非保证带宽和尽力而为带宽
B.
固定带宽、保证带宽、尽力而为带宽和非保证带宽
C.
保证带宽、固定带宽、非保证带宽和尽力而为带宽
D.
保证带宽、非保证带宽、固定带宽和尽力而为带宽
【单选题】GPON将业务带宽分配方式分为4种类型,优先级从高到低分别是()。
A.
保证带宽、固定带宽、非保证带宽和尽力而为带宽
B.
保证带宽、非保证带宽、固定带宽和尽力而为带宽
C.
固定带宽、保证带宽、尽力而为带宽和非保证带宽
D.
固定带宽、保证带宽、非保证带宽和尽力而为带宽
【单选题】特定时间内从用户向互联网传送信息的带宽是()
A.
上行带宽
B.
下行带宽
C.
对称带宽
D.
非对称带宽
【判断题】信号带宽必须小于系统带宽。()
A.
正确
B.
错误
【单选题】总线型网访问控制技术机制是()。
A.
争用带宽
B.
预约带宽
C.
循环使用带宽
D.
按优先级分配带宽
【单选题】对于载荷信息的实物,我们通过参观获取其色泽、轮廓、造型或结构方面信息的信息内容理解方式是 ( )
A.
阅读
B.
收听
C.
观摩
D.
培训
【简答题】无线信道的相干带宽____信号带宽。
【单选题】GPON将业务带宽分配方式分成4种类型,优先级从高到低分别是()
A.
保证带宽、非保证带宽、固定带宽和尽力而为带宽
B.
保证带宽、固定带宽、非保证带宽和尽力而为带宽
C.
固定带宽、保证带宽、非保证带宽和尽力而为带宽
D.
固定带宽、保证带宽、尽力而为带宽和非保证带宽
【单选题】T细胞和B细胞均有的表面标志是( )
A.
抗原受体
B.
TCR
C.
BCR
D.
CD2
E.
CD5
【单选题】陕西省少数民族中人口最多的民族是()。
A.
蒙古族
B.
藏族
C.
回族
D.
哈萨克族
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