1.For proper air balance, the total resistance of the duct system must equal the_____at the fan discharge.
1.为了实现适当的气流平衡，风管系统的总阻力必须等于风机排风口的______。
2.Which refrigerant is rarely used in household refrigeration systems?
2.下列哪种制冷剂很少用于家用制冷系统中？
3.The pressure that pushes outward on duct walls due to fan compression is called___.
3.由于风机的压缩作用而对风管壁产生向外推力的压力，被称为______。
4.R-134a refrigerant is most commonly applied today in which of the following?
4.如今，R-134a 制冷剂最常应用于下列哪种设备中？
5.Which supply register placement generally provides the highest system efficiency?
5.哪种送风口布置方式通常能提供最高的系统效率？
6.Most refrigerants have sufficiently high critical temperatures except carbon dioxide and ______.
6.大多数制冷剂都具有足够高的临界温度，但二氧化碳和______除外。
7.Which factors have a direct influence on the building envelope load?
7.下列哪些因素对建筑围护结构的负荷有直接影响？
8.What role does the Montreal Protocol play regarding future refrigerants?
8.关于未来的制冷剂，《蒙特利尔议定书》发挥了什么作用？
9.Wall area load calculations are based on using ___percent of the ___wall area.
9.墙体面积负荷的计算是基于使用______%的______墙体面积。
10.When water vapor is absorbed by a desiccant, its temperature rises and consequently ______ the nearby air.
10.当水蒸气被干燥剂吸收时，其温度会升高，从而 ______ 周围的空气。
