【单选题】【消耗次数:1】
热水采暖系统膨胀水箱的作用是( )。
加压
减压
定压
增压
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相关题目
【单选题】 热水采暖系统膨胀水箱的作用是
①  加压
②  减压
③  定压
④  增压
【单选题】 热水采暖系统膨胀水箱的作用是
①  加压
②  减压
③  定压
④  增压
【单选题】 按热水采暖系统的循环动力不同,可分为自然循环热水采暖系统和机械循环热水采暖系统。( )
①  正确
②  错误
【单选题】 根据热水采暖系统的供水温度的不同可分为两种,即一般热水采暖系统和( )。
①  低温热水采暖系统
②  高温热水采暖系统
【判断题】 民用建筑多采用热水采暖系统,而不是蒸汽采暖系统
①  正确
②  错误
【单选题】 按热媒的不同分采暖系统可分为热水采暖系统 、蒸汽采暖系统两种系统。
①  正确
②  错误
【单选题】 高压蒸气采暖系统中、减压阀的作用是使( )。
①  阀前压力增大、阀后压力也增大
②  阀前压力增大,阀后压力减小
③  阀前压力增大,阀后压力不变
④  阀前压力不变,阀后压力减小
【单选题】 热水采暖系统中存有空气未能排除,引起气塞,会产生( )。
①  系统回水温度过低
②  局部散热器不热
③  热力失调现象
④  系统无法运行
【单选题】 双管热水采暖系统是指上下层散热器供水是()的。
①  串联?
②  混合???
③  交叉
④  并联
【单选题】 低温热水采暖系统的供水温度为( )℃,回水温度为( )℃。
①  100、75
②  95、75
③  100、70
④  95、70
随机题目
【单选题】 It became harder for women married to diplomats(外交家) to _______ their own interests.
①  pursue
②  replace
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④  convince
【单选题】 As a result of his hard work, he has gained ______ to the Beijing University.
①  access
②  commitment
③  opportunity
④  reward
【单选题】 Planning so far ahead _____ no sense -- so many things will have changed by next year.
①  made
②  is making
③  makes
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【单选题】 How can you keep the machine ()when you are away?
①  run
②  to run
③  running
④  being run
【单选题】 I hate people who ____ the end of a film that you haven’t seen before.
①  reveal
②  rewrite
③  revise
④  reverse
【单选题】 Since the matter was extremely _____, we dealt with it immediately.
①  tough
②  tense
③  urgent
④  instant
【单选题】 As to who is to be hired, it is the Human Resources Department()has the final say.
①  whose
②  those
③  these
④  that
【单选题】 Twenty people were _______ wounded in the air crash.
①  quickly
②  wrongly
③  bitterly
④  seriously
【单选题】 Evidence came up _____ specific sounds are recognized by babies as young as 6 months old.
①  what
②  that
③  which
④  why
【单选题】 As a result of careless washing the jacket _____ to a child’s size.
①  compressed
②  shrank
③  dropped
④  decreased