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【单选题】
以下关于采用加压系统回收凝结水时应符合的要求说法错误的是( )。
A.
凝结水泵站的位置应按用户分布情况确定，当一个凝结水系统有几个凝结水泵站时，凝结水泵的选择应符合并联运行的要求
B.
当采用疏水加压器作为加压泵时，在各用汽设备的凝结水管道上应装设疏水阀，当疏水加压器兼有疏水阀和加压泵两种作用时，其装设位置应接近用汽设备，并使其上部水箱高于系统的最低点
C.
凝结水泵站内的水泵宜设置2台，其中1台备用，每台凝结水泵的流量应满足每小时最大凝结水回收量，其扬程应按凝结水系统的压力损失、泵站至凝结水箱的提升高度和凝结水箱的压力进行计算
D.
每个凝结水泵站宜设置1个凝结水箱，常年不问断运行的系统宜设置2个；凝结水有被污染的可能设置2个；其总有效容积宜为15～20分钟的最大凝结水回收量
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举一反三
【判断题】求函数 的定义域(2,5)。
A.
正确
B.
错误
查看完整题目与答案
【单选题】Which of the following does not contribute to the Freshman 15?
A.
underestimating the serving sizes
B.
eating too much junk food
C.
having too much alcoholic drink
D.
they have no time to eat
查看完整题目与答案
【简答题】(12分 1,3,5 )已知函数 .   (1)求函数 的定义域. (2)若 是两个模长为2的向量 的夹角,且不等式 对于定义域内的任意实数 恒成立,求 的取值范围.
查看完整题目与答案
【单选题】Section C Directions: In this section, you will hear two passages. At the end of each passage, you will hear three questions. Both the passage and the questions will be spoken only once. After you hea...
A.
Many of us are willing to pay more for health food.
B.
Many of us will pay the price for eating too much.
C.
Many of us risk our health eating unhealthy food.
D.
Many of us aren't afraid of gaining a bit of extra fat.
查看完整题目与答案
【单选题】Questions 13 to 15 are based on the passage you have just heard.
A.
Salt is quite necessary for people’s health.
B.
Eating too much salt could do harm to the heart.
C.
The quantity of salt varies among different people.
D.
13.People are launching a campaign to eat less salt.
查看完整题目与答案
【单选题】passage two questions 13 to 15 are based on the passage you have just heard. 13
A.
salt is quite necessary for people's health
B.
eating too much salt could do harm to the heart
C.
the quantity of salt varies among different people
D.
people are launching a campaign to eat less salt
查看完整题目与答案
【简答题】（1）求不等式的解集：-x 2 +4x+5＜0 （2）求函数的定义域： y= x-1 x+2 +5 ．
查看完整题目与答案
【单选题】求函数的定义域
A.
{x∕x≠3}
B.
{x∕x≥3}
C.
全体实数R
D.
{x∕x 2}
查看完整题目与答案
【单选题】Eating too much fat can _____ heart disease and cause high blood pressure.
A.
contribute to
B.
attribute to
C.
attest to
D.
devote to
查看完整题目与答案
【单选题】以下关于少数民族服饰历史发展的描述不正确的是
A.
清代各民族服饰已具备各自的特点,且支系间的差异也反应到服饰上。
B.
在新石器时代出现了十分特殊的民族服饰——“贯头衣”、“披围式长衫”。
C.
战国中后期至自秦汉时期,中国民族文化交流达到了空前未有的广度和深度。赵武灵王的“胡服骑射”成为这个时期中国民族服饰文化交流、发展中的一大创新和亮点。
D.
满族的形成,不但把我国草原游牧民族的服饰文化提高到了崭新的发展阶段,并且对服饰的穿戴进行了严格规定。
查看完整题目与答案
相关题目：
【判断题】求函数 的定义域(2,5)。
A.
正确
B.
错误
查看完整题目与答案
【单选题】Which of the following does not contribute to the Freshman 15?
A.
underestimating the serving sizes
B.
eating too much junk food
C.
having too much alcoholic drink
D.
they have no time to eat
查看完整题目与答案
【简答题】(12分 1,3,5 )已知函数 .   (1)求函数 的定义域. (2)若 是两个模长为2的向量 的夹角,且不等式 对于定义域内的任意实数 恒成立,求 的取值范围.
查看完整题目与答案
【单选题】Section C Directions: In this section, you will hear two passages. At the end of each passage, you will hear three questions. Both the passage and the questions will be spoken only once. After you hea...
A.
Many of us are willing to pay more for health food.
B.
Many of us will pay the price for eating too much.
C.
Many of us risk our health eating unhealthy food.
D.
Many of us aren't afraid of gaining a bit of extra fat.
查看完整题目与答案
【单选题】Questions 13 to 15 are based on the passage you have just heard.
A.
Salt is quite necessary for people’s health.
B.
Eating too much salt could do harm to the heart.
C.
The quantity of salt varies among different people.
D.
13.People are launching a campaign to eat less salt.
查看完整题目与答案
【单选题】passage two questions 13 to 15 are based on the passage you have just heard. 13
A.
salt is quite necessary for people's health
B.
eating too much salt could do harm to the heart
C.
the quantity of salt varies among different people
D.
people are launching a campaign to eat less salt
查看完整题目与答案
【简答题】（1）求不等式的解集：-x 2 +4x+5＜0 （2）求函数的定义域： y= x-1 x+2 +5 ．
查看完整题目与答案
【单选题】求函数的定义域
A.
{x∕x≠3}
B.
{x∕x≥3}
C.
全体实数R
D.
{x∕x 2}
查看完整题目与答案
【单选题】Eating too much fat can _____ heart disease and cause high blood pressure.
A.
contribute to
B.
attribute to
C.
attest to
D.
devote to
查看完整题目与答案
【单选题】以下关于少数民族服饰历史发展的描述不正确的是
A.
清代各民族服饰已具备各自的特点,且支系间的差异也反应到服饰上。
B.
在新石器时代出现了十分特殊的民族服饰——“贯头衣”、“披围式长衫”。
C.
战国中后期至自秦汉时期,中国民族文化交流达到了空前未有的广度和深度。赵武灵王的“胡服骑射”成为这个时期中国民族服饰文化交流、发展中的一大创新和亮点。
D.
满族的形成,不但把我国草原游牧民族的服饰文化提高到了崭新的发展阶段,并且对服饰的穿戴进行了严格规定。
查看完整题目与答案