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【简答题】
在一单列管式换热器中,将 2000kg/h 的空气从 20 °C加热到 80 °C,空气在钢质列管内作湍流流动,管外用饱和水蒸汽加热。列管总数为 200 根,长度为 6m ,管子规格为 φ 38 × 3mm 。现因生产要求需要设计一台新换热器,其空气处理量保持不变,但改为 400 根,管子规格改为 φ 19 × 1.5mm ,操作条件不变,试求此新换热器的管子长度为多少
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参考答案:
举一反三
【多选题】下列选项中属于教师享有的权利的是()
A.
参加进修或者其他方式的培训
B.
批评和抵制有害于学生健康成长的现象
C.
进行教育教学活动,开展教育教学改革和实验
D.
从事科学研究、学术交流,参加专业的学术团体,在学术团体中充分发表意见
查看完整题目与答案
【单选题】It can be inferred from the passage that, according to UK law, 'gay marriage' ______.
A.
should be performed in a church
B.
is partnership not legally admitted
C.
doesn't allow the couple to adopt any children
D.
is not really a 'marriage'~' in the literal sense of the word
查看完整题目与答案
【多选题】下列关系中,属于教育基本活动规律的有( )。
A.
教育与生产力之间的矛盾或关系
B.
教育现象内部各要素之间的矛盾或关系
C.
教育与社会发展之间的矛盾或关系
D.
教育与人的身心发展之间的矛盾或关系
查看完整题目与答案
【单选题】At some UK universities, some professional degrees like medicine, veterinary, law etc. have longer programs that can be as much as ______ years.
A.
Eight
B.
Six
C.
Five
D.
Ten
查看完整题目与答案
【单选题】The UK has three distinct systems of law: English law, Northern Ireland law and ▁ law .
A.
Scots
B.
Welsh
查看完整题目与答案
【多选题】下列关系中属于教育活动基本规律的有( )。
A.
教育与生产力之间的矛盾和关系
B.
教育现象内部各要素之间的矛盾和关系
C.
教育和社会发展之间的矛盾和关系
D.
教育与人的身心发展之间的矛盾和关系
查看完整题目与答案
【单选题】There is no written constitution in UK. It is made up of the following EXCEPT
A.
Statute Law.
B.
the Common Laws.
C.
Conventions.
D.
Property Law.
查看完整题目与答案
【判断题】抽样调查也称抽样推断,是按照随机原则从总体中抽选部分单位进行调查,并根据调查的结果推断总体特征的一种全面调查。
A.
正确
B.
错误
查看完整题目与答案
【单选题】What has the UK government agreed to do concerning tobacco packaging?
A.
Pass a law to standardise cigarette packaging.
B.
Rid cigarette cartons of all advertisements.
C.
Subsidise companies to adopt plain packaging.
D.
Reclassify cigarettes according to packaging.
查看完整题目与答案
【单选题】All children in the UK must, by law, receive a full-time education from the age of______to______.
A.
5; 16
B.
6, 17
C.
7; 18
D.
5; 18
查看完整题目与答案
相关题目:
【多选题】下列选项中属于教师享有的权利的是()
A.
参加进修或者其他方式的培训
B.
批评和抵制有害于学生健康成长的现象
C.
进行教育教学活动,开展教育教学改革和实验
D.
从事科学研究、学术交流,参加专业的学术团体,在学术团体中充分发表意见
查看完整题目与答案
【单选题】It can be inferred from the passage that, according to UK law, 'gay marriage' ______.
A.
should be performed in a church
B.
is partnership not legally admitted
C.
doesn't allow the couple to adopt any children
D.
is not really a 'marriage'~' in the literal sense of the word
查看完整题目与答案
【多选题】下列关系中,属于教育基本活动规律的有( )。
A.
教育与生产力之间的矛盾或关系
B.
教育现象内部各要素之间的矛盾或关系
C.
教育与社会发展之间的矛盾或关系
D.
教育与人的身心发展之间的矛盾或关系
查看完整题目与答案
【单选题】At some UK universities, some professional degrees like medicine, veterinary, law etc. have longer programs that can be as much as ______ years.
A.
Eight
B.
Six
C.
Five
D.
Ten
查看完整题目与答案
【单选题】The UK has three distinct systems of law: English law, Northern Ireland law and ▁ law .
A.
Scots
B.
Welsh
查看完整题目与答案
【多选题】下列关系中属于教育活动基本规律的有( )。
A.
教育与生产力之间的矛盾和关系
B.
教育现象内部各要素之间的矛盾和关系
C.
教育和社会发展之间的矛盾和关系
D.
教育与人的身心发展之间的矛盾和关系
查看完整题目与答案
【单选题】There is no written constitution in UK. It is made up of the following EXCEPT
A.
Statute Law.
B.
the Common Laws.
C.
Conventions.
D.
Property Law.
查看完整题目与答案
【判断题】抽样调查也称抽样推断,是按照随机原则从总体中抽选部分单位进行调查,并根据调查的结果推断总体特征的一种全面调查。
A.
正确
B.
错误
查看完整题目与答案
【单选题】What has the UK government agreed to do concerning tobacco packaging?
A.
Pass a law to standardise cigarette packaging.
B.
Rid cigarette cartons of all advertisements.
C.
Subsidise companies to adopt plain packaging.
D.
Reclassify cigarettes according to packaging.
查看完整题目与答案
【单选题】All children in the UK must, by law, receive a full-time education from the age of______to______.
A.
5; 16
B.
6, 17
C.
7; 18
D.
5; 18
查看完整题目与答案
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