相关试题
【判断题】
排污损失水量与冷却塔的蒸发损失水量和浓缩倍率无关
【判断题】
循环水中CO2散失后，重碳酸盐硬度易转变成碳酸钙从水中析出
【判断题】
锅炉炉管的向火侧较背火侧易发生腐蚀、过热和爆管
【判断题】
循环水的浓缩倍率越高，其中Ca(HCO3)2分解的可能越小
【判断题】
在混床运行中，阴、阳离子的交换反应几乎是同时进行的，基本上清除了交换的影响，故出水水质很好
【判断题】
在正常运行中时，阳离子交换器出水的酸度，近似等于进水中氯离子，硫酸根及硝酸根等各种阴离子的总和
【判断题】
游离CO2的腐蚀使金属均匀地变薄，不会引起金属的严重损伤，故不需引起重视
【判断题】
一般对钢铁有缓蚀效率的缓蚀剂，同样对铜也有效
【判断题】
锅炉炉水的运行指标都应是通过化学试验而定的
【判断题】
在有奥氏体钢的系统内不用含氯离子的清洗剂
【判断题】
发电机铜导线内结水垢越厚，发电机线棒温度越低
【判断题】
混床中，如果阴、阳树脂的配比稍有变化，会对出水水质产生明显影响
【判断题】
同一种树脂在不同水质条件下，工作交换容量有一定差异
【判断题】
对于混合床来说，在通常范围内，进水含盐量的变化或树脂再生度的不同，基本上只影响混床运行周期的长短而不影响出水水质
【判断题】
对混床来说，在通常的树脂层高度范围内，树脂层高度和运行流速对出水水质的影响不大
【判断题】
当锅炉负荷急剧增加，炉水中PO43-减少，酚酞碱度升高，是因为发生了盐类暂时消失现象
【判断题】
热力设备运行工况对热力设备的腐蚀有很大影响
【判断题】
一般地，同一水质条件下，参数越高的机组，腐蚀速度越高
【判断题】
热力设备的停用腐蚀，基本都属于二氧化碳腐蚀
【判断题】
当强酸、碱溅到皮肤上时，应用大量清水冲洗，再分别用5mg/L的碳酸氢钠或10～20mg/L的稀醋酸清洗，然后送医院急救
【判断题】
凝结水中漏入冷却水的数量多少，主要取决于汽轮机运行负荷的大小
【判断题】
金属原子形成的离子都是阳离子，所以阳离子都是金属原子形成的
【判断题】
电解质溶液导电能力的强弱取决于溶液中自由移动离子浓度的大小
【判断题】
若精处理出水水质较好，混床旁路门可以开启，凝结水走旁路
【判断题】
分子和原子的主要区别是：分子可以构成物质，原子不行
【判断题】
石灰石和盐酸溶液作用可产生二氧化碳气体
【判断题】
溶解度只与溶质和溶液的性质有关，而与温度无关
【判断题】
在碳的一种氧化物中，碳元素与氧元素的质量比是3：8，则该氧化物中碳原子与氧原子的个数比也为3：8
【判断题】
系统误差和随机误差都可以避免，而过失误差却不可避免
【判断题】
某溶液的PH值为1，此溶液中已无OH-离子
【判断题】
Ca（OH）2的溶解度随温度的升高而略有增加
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In their letter to the students’ representative assembly, the freshmen insisted on __________ in the Student Union.___
A. represented
B. being represented
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Nobody noticed the thief slip into the house because the lights happened to _____.___
A. be put up
B. give in
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----- John， may I ask you a favour？ ----- _________
A. I’m sorry， but why？
B. Sure，what is it？
C. Yes，you could.
D. I’d love to，and I’m busy.
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The two thieves fled the town separately， _______ a bag.___
A. each carrying
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Her heart _____ faster when she entered the exam hall.___
A. jumped
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The taxi driver was put in_____prison because his car had knocked down a child.His wife went to_____ prison to see him twice a month.___
A. /； /
B. the； the
C. /； the
D. the； /
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----- Where’s John， do you know？ ----- Oh， _____to hospital.___
A. he’s taken
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It was the wealth of the_____pioneer landowner John Harvard that made Harvard University possible.___
A. precious
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C. anxious
D. prosperous
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----- "Where is your college located, John?" ----- "It is ________."___
A. on the Fifth Avenue
B. on Fifth Avenue
C. in Fifth Avenue
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__________ is she in London than she rings up her old friend Mary.___
A. Scarcely
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A fireman discovered the __________ of the fire.___
A. truth
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he weather __________ us from climbing the mountain.___
A. discharged
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C. disturbed
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I didn't expect to receive a postcard from you！It's really _____my wildest imagination.___
A. behind
B. beyond
C. except
D. through
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John Smith is _____ honest young man.___
【单选题】
She __________ in wearing that old – fashioned hat.___
A. insists
B. persists
C. assists
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Some of the meat came from Canada. How about________？___
A. another
B. the other
C. others
D. the rest
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I have brought you ___ flowers for your birthday. ___
A. few
B. a few
C. little
D. a little
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I have also experienced many adventures, but nothing that I have seen ___what you have described. ___
A. compares
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That young man has made so much noise that he ___ not have been allowed attend the concert. ___
A. could
B. must
C. would
D. should
【单选题】
“What is Mary doing at home?” “She is playing ____.”___
A. a piano
B. her piano
C. piano
D. the piano
【单选题】
I’m busy now ,ask him to see me ____ time.___
A. the other
B. some other
C. other
D. another
【单选题】
The child took a spoonful and tasted it carefully __________ it was hot.___
A. in case
B. provided
C. if
D. unless
【单选题】
The French pianist who had been praised very highly __________ to be a great disappointment. ___
A. turned off
B. turned up
C. turned out
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“Shall I turn on the television?” – “No, I’d rather not __________ television tonight.”___
A. have watched
B. to watch
C. watch
D. for watching
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They said that they had made up their minds to ____the task in spite of the extremely difficult conditions.___
A. carry on
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The two girls are getting on very well and share with each other. ___
A. little
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C. some
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The teacher said that the classroom was empty __________ a few chairs.___
A. but for
B. except for
C. apart from
D. besides
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______you choose， make sure that it is a good one. ___
A. What
B. Wherever
C. Whichever
D. Which
【单选题】
Vingo was released from prison_____the successful efforts of his friends to prove his innocence. ___
A. according to
B. as a result of
C. for reasons of
D. with the help of
【单选题】
Entering the room， I found my father __ at the desk and ___ something .___
A. seat... write
B. seated ... wrote
C. seated ... writing
D. seating ... writing
【单选题】
Cake __________ of flour, sugar, egg and some other ingredients. ___
A. contained
B. consists
C. includes
D. composed
【单选题】
Mr. Peter wanted Steve to take half the money, but Steve did not __________ it. ___
A. obtain
B. achieve
C. accept
D. receive
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I'd like to take my picture ________stands a high tower. ___
A. where
B. which
C. that
D. there
【单选题】
__________ the English examination I would have gone to the concert last Saturday. ___
A. But for
B. As for
C. In spite of
D. Because of
【单选题】
Cars moved very slowly in the 1920s, but they ______move more quickly than in 1910.___
A. were to can
B. did
C. will
D. can
【单选题】
The little girl needs __________ after her shock. ___
A. being comforted
B. be comforted
C. comforting
D. comforted
【单选题】
The __________ horse ran away from the fire.___
A. having frightened
B. frightening
C. frightened
D. frighten
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He is __________ of an actor. ___
A. anybody
B. anything
C. somebody
D. something
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You can take ______ seat you like. ___
A. no matter what
B. no matter which
C. what
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He changed his name， _____ that nobody would find out what he had done before. ___
A. having thought
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