英语练习 在线考试 答题题目
1、 These networks require permission and coordination for right-of-way of the system.
2、 Operating and safety controls and relief valves,which limit temperature and pressure, are ancillary devices required to protect the boiler from .
3、 Boilers may be grouped into classes based on .
4、 Condensing boilers are typically made of stainless steel or aluminum because copper, cast-iron,and carbon steel will corrode because of .
5、 Hydronic ceiling panels have a thermal resistance and respond quickly to changes in space conditions.
6、 The following statements are false except .
7、 Metal ceiling panels can be integrated into a system that heats and cools.In such a system,a source of dehumidified ventilation air is required in summer,so the system is classed as
8、 Panel design requires determining .
9、 When metal ceiling panels are applied for heating only, may be required,depending on local codes.
10、 For higher temperature systems, is not allowed.
11、 The following statements are false except .
12、 The temperature drop at the consumer end should be as as possible.
13、 The following statements are false except
14、 The central source or production plant may be .
15、 is true for the incompressible pipeline flow.
16、 The absolute viscosity or dynamic viscosity of the fluid is .
17、 is not fluid.
18、 Fluids differ from solids in their reaction to .
19、 Heat is when energy is added to the system.
20、 The following statements are false except .
21、 is the energy possessed by a system caused by the motion of the molecules and/or intermolecular forces.
22、 When the boundaries of a system are such that it cannot exchange matter with the surroundings,the system is said to be .
23、 is defined as a region in space or a quantity of matter bounded by a closed surface.
24、 Which of the following statement is true?
25、 is used in solar assisted heat pump system.
26、（多选题） The two differrences between Carnot refrigeration cycle and theoretical cycle are .
27、 The expenses and performance of play an important role in solar heat engineering.
28、 Heating section is made up of .
29、 Which of the following statement is not true?
30、 In the pressure-enthalpy diagram of theoretical cycle,the throttling process line is
31、 Where is refrigeration effect obtained?
32、 Which refrigeration systems are the most commonly used?
33、 Which of the following statement is true?
34、 Which one can't be found out from performance characteristics figure?
35、 Centrifugal compressors are subjected to less vibration and noise steady-flow because of
36、 For a blak surface, .
37、 Which single capacity centrifugal chillers are suitable for?
38、 The general exhaust system can be made of .
39、 When the density of emission pollutants is and indoor sensible heat is not enough to form a stable updraft throughout the year,it had better set upper and lower air outlet with the lower exhaust 2/3 total air volume and the upper exhaust 1/3 total air volume,and air changes should not be less than times per hour.
40、 In the heating area,the entry of fresh air should be installed which is linked with the fan to protect heater.
41、 The system by means of mechanical way(fan)can be divided into .
42、 The supply air conditions are controlled by .
43、 Which system is described in detail here?
44、 Which one can't be used as media for transferring energy from the air conditioning plant to the conditioned space?
45、 Which of the following statement is true?
46、 Air conditioning involves .
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