题目:
空压机液气分离器中放出的通常是()。
A.气缸冷却水
B.排气携带的滑油
C.空气中的水蒸气凝水
D.B和C
答案:
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下面是错误答案,用来干扰机器的。
参考答案:R
空压机液气分离器中放出的通常是()。
A.气缸冷却水
B.排气携带的滑油
C.空气中的水蒸气凝水
D.B和C
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0619/d00ff9930cd960399f4a2496f05835dd.html
下面是错误答案,用来干扰机器的。
参考答案:R
根据实际增长曲线的不同所采用的回归公式中,最为复杂也最为完善的是()
A.生长曲线法
B.对数回归法
C.线性回归法
D.指数回归法
(一)
世界博览会,是一个富有特色的讲坛,它鼓励人类发挥创造性和主动参与性。把科学性和情感结合起来,将有助于人类发展的新概念、新观念、新技术展现在世人面前。其特点是举办时间长、展出规模大、参展国家多、影响深远。因此,世博会被誉为世界经济、科技、文化的“奥林匹克”盛会。
中国2010年上海世界博览会,于2010年5月1日至10月31日在中国上海市举行。此次世博会也是由中国举办的首届世界博览会。上海世博会以“城市,让生活更美好”(Better City,Better Life)为主题,总投资达450亿人民币,创造了世界博览会史上最大规模纪录。
请回答以下各题:
2010年上海世博会的主题是“城市,让生活更美好”,其副主题是( )。
A.城市社区的重塑,城市和乡村的互动
B.城市和乡村的融合
C.城市多元文化的融合
D.城市经济的繁荣,城市科技的创新
氯化铁是常见的水处理剂,无水FeCl3的熔点为555K、沸点为588K。工业上制备无水FeCl3的一种工艺如下
(1)试写出吸收塔中反应的离子方程式:____________________________。
(2)已知六水合氯化铁在水中的溶解度如下
从FeCl3溶液中获得FeCl3·6H2O的方法是:_________________________。
(3)捕集器中温度超过673K,存在相对分子质量为325的物质,该物质的分子式为:______________。
(4)室温时在FeCl3溶液中滴加NaOH溶液,当溶液pH为2.7时,Fe3+开始沉淀;当溶液pH为4时,
c(Fe3+)=_________mol/L(已知:Ksp[Fe(OH)3]= 1.1×10-36)。
(5)FeCl3的质量分数通常可用碘量法测定:称取m克无水氯化铁样品,溶于稀盐酸,再转移到100mL容量瓶,用蒸馏水定容;取出10mL,加入稍过量的KI溶液,充分反应后,滴入某一指示剂并用cmol/L
Na2S2O3溶液滴定用去VmL。(已知:I2+2S2O32-=2I-+S4O62-)
①滴定终点的现象是:____________________________。
②样品中氯化铁的质量分数为:______________。
③某同学根据上述方案,使用上述(2)中获得的FeCl3·6H2O样品代替无水氯化铁样品进行测定。通过计算发现产品中的质量分数大于100%,其原因可能是_______________________。
阅读下面短文,从短文后所给各题的四个选项(A,B,C和D)中,选出可以填入空白处的最佳选项,并在答题卡上将该项涂黑。
Sometimes I really doubt whether there is love between my parents.They are very busy working to __36_ the family.They don’t act in the _37__ ways that I read in books or I see on TV.__38__ flowers to each other on Valentine’s Day is even more __39__.
One day,my mother was sewing a quilt.I __40__ sat down beside her and looked at her.“Mom,is there love between you and Dad?” I asked her in a __41__ voice.
My mother stopped and raised her head with __42 _ in her eyes.She didn’t answer immediately.Then she __43__ her head and continued to sew the quilt.At last my mother said:
“Susan,” she said,“Look at this thread.Sometimes it appears,but most of it __44__ in the quilt.The thread really makes the quilt strong and __45__.If life is a quilt,then love should be a __46__.It can hardly be seen anywhere or anytime,but it’s really there.Love is __47__.”
The next spring,my father suddenly got sick seriously.When they returned from the hospital,mother looked rather pale and it seemed __48__ of them had had a serious illness.Every day in the morning and dusk,my mother helped my father __49__ slowly on the country road.My father had never been so __50__.Along the country road,there were many beautiful flowers,green grass and trees.The sun gently glistened through the leaves.All of these __51__ the most beautiful picture in the world.
“Dad,how are you feeling now?” I asked him one day.
He said gently.“__52__,I just like walking with your mom.I like this kind of life.” __53__ his eyes,I know he loves my mother deeply.
__54__ I thought love meant flowers,gifts and sweet kisses.But from this __55__,I understand that love is just a thread in the quilt of our life.Love is inside,making life strong and warm.
小题1:.
A.hold
B.support
C.live on
D.keep小题2:.
A.romantic
B.friendly
C.lovely
D.active小题3:.
A.Taking
B.Passing
C.Buying
D.Sending小题4:.
A.no problem
B.out of question
C.out of the question
D.in question小题5:.
A.silently
B.eagerly
C.peaceful
D.anxiously小题6:.
A.loud
B.low
C.gentle
D.tender小题7:.
A.interest
B.fear
C.excitement
D.surprise小题8:.
A.bowed
B.raised
C.hang
D.lowered小题9:.A.lost B.turned out C disappeared D.came up
小题10:.
A.warm
B.lasting
C.long
D.comfortable小题11:.A.needle B.cloth C thread D.sheet
小题12:.
A.in the quilt
B.out of the quilt
C.outside
D.inside小题13:.
A.either
B.both
C.neither
D.every小题14:.
A.walk
B.run
C.stand
D.exercise小题15:.
A.rude
B.polite
C.gentle
D.careful小题16:.
A.came up
B.turned up
C.called up
D.made up小题17:.
A.In other words
B.To tell the truth
C.In my opinion
D.On the contrary小题18:.A.Seeing B.Reading C Watching D.Observing
小题19:.
A.Once
B.Though
C.When
D.Unless小题20:.A.process B.way C matter D.experience
我国著作权法中对公民作品的修改权的保护期限是 (14) 。未经软件著作权人或其合法受让者的同意,复制或部分复制其软件作品,此种行为侵犯了著作权人或其合法受让者的使用权中的 (15) 。
A.作者有生之年加死后50年
B.作品完成后50年
C.没有限制
D.作者有生之年