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【简答题】
Ten-year-old Johnny was one of the laziest boys in his class. His homework was always and it was usually wrong. He only did half the number of math problems the other children did and in his compositions  he _____ half the number of words. And usually the words were _ spelled because he was too lazy to use a One day his class went on a bus trip. The ____ did not want to take Johnny with them. But there was no one to look after Johnny at the school so she had to take .'Now, children,' the teacher said, 'On our bus trip we will ____ old buildings, some beautiful countryside, and many other things. I want you to write about _____ i nteresting you see on the trip. 'The bus trip . The children looked out of the windows at all the interesting things. They took notes _____ their notebooks. The teacher was very____ with them. Then she saw Johnny on the floor of the bus and went up to him. 'Are you ?' she asked him. 'No.' he said. 'Then are you lying on the floor?' 'If I can't see anything,' he said, 'I can't write about it, can I?' 小题1: A.late B.early C.good D.fine 小题2: A.that B.who C.what D.whom 小题3: A.learned B.made C.wrote D.read 小题4: A.badly B.well C.correctly D.nicely 小题5: A.radio B.pen C.library D.dictionary 小题6: A.driver B.mother C.father D.teacher 小题7: A.him B.himself C.his D.he 小题8: A.hear B.listen to C.see D.feel 小题9: A.nothing B.something C.nobody D.everybody 小题10: A.ended B.began C.finished D.closed 小题11: A.over B.by C.in D.at 小题12: A.angry B.pleased C.sad D.careful 小题13: A.standing B.sitting C.eating D.lying 小题14: A.busy B.sick C.happy D.glad 小题15: A.where B.what C.how D.why
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【单选题】安装在排烟系统管道上的防火阀的动作温度是多少?
A.
100°C
B.
280°C
C.
70°C
D.
140°C
【单选题】排烟防火阀的动作温度是()
A.
280℃
B.
140℃
C.
93℃
D.
178℃
【单选题】排烟防火阀的组成、形状和工作原理与防火阀相似。其不同之处主要是安装管道和动作温度不同,防火阀安装在通风、空调系统的管道上,动作温度为()℃,而排烟防火阀安装在排烟系统的管道上,动作温度为()℃。
A.
270;80
B.
80;270
C.
280;70
D.
70;280
【简答题】( ) 数字图象技术 ( ) 电路测量技术
【单选题】在排烟支管上要求设置的排烟防火阀的作用是( )
A.
烟气温度超过280℃自动关闭
B.
烟气温度达70't2自动开启
C.
与风机联锁,当烟温达280℃时关闭风机
D.
与风机联锁,当烟温达70℃时启动风机
【简答题】阅读《我与地坛》中的一段文字,回答问题:有一回我摇车出了小院,想起一件什么事又返身回来,看见母亲仍站在原地,还是送我走时的姿势,望着我拐出小院去的那处墙角,对我的回来竟一时没有反应。待她再次送我出门的时候,她说:“出去活动活动,去地坛看看书,我说这挺好。”以后我才渐渐听出,母亲这话实际上是自我安慰,是暗自的祷告,是给我的提示,是恳求与嘱咐。只是在她猝然去世之后,我才有余暇设想。当我不在家里的...
【多选题】下列关于防火阀的说法正确的是( )。
A.
有熔断器的防火阀,其动作温度宜为280℃
B.
防火阀宜靠近防火分隔处设置
C.
防火阀安装时,可明装也可暗装
D.
为保证防火阀能在火灾条件下发挥作用,穿过防火墙两侧各2m范围内的风管绝热材料应采用不燃材料且具备足够的刚性和抗变形能力,穿越处的空隙应用不燃材料或防火封堵材料严密填实
E.
可分为防火类、防烟类、排烟类三种
【单选题】排烟防火阀的动作温度是( )。
A.
70℃
B.
72℃
C.
280℃
D.
273℃
【简答题】(8分)小丽的妈妈买了一台全自动豆浆机,如图甲所示.图乙是豆浆机的主要结构:中间部分是一个带动刀头的电动机,用来将原料进行粉碎打浆;外部是一个金属圆环形状的电热管,负责对液体加热煮沸.图丙是豆浆机正常工作时,做一次豆浆的过程中,电热管和电动机交替工作的“P﹣t”图象.下表是这个豆浆机的主要技术参数. 型号 SYL﹣666 额定电压 220V 额定频率 50Hz 电机功率 120W 加热功率 121...
【单选题】排烟系统中防火阀的作用是(),其动作温度是()度
A.
排烟,280
B.
阻断火势蔓延,70
C.
阻断火势蔓延,280
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