1.What compensates for friction losses within duct systems?
1.是什么补偿了风管系统内部的摩擦损失？
2.Moisture can be introduced into conditioned air using a:
2.可以通过以下哪种设备向调节空气中引入水分：
3.The most common control voltage in thermostat circuits is:
3.控器电路中最常用的控制电压是：
4.If a single union is installed in a piping system, it should be located on the ______ side of the steam trap.
4.如果在管道系统中安装了一个活接头（union），它应位于疏水阀的 ______ 侧。
5.The purpose of a hot gas bypass in an AC system is to:
5.空调系统中热气旁通装置的目的是：
6.A dehydrator is designed to remove ______ along with noncondensable gases.
6.干燥器（脱水器）的设计目的是去除 ______ 以及不可凝气体。
7.If the evaporator coil is one floor below the roof condenser, a trap must be installed on the:
7.如果蒸发器盘管位于屋顶冷凝器下方一层楼的位置，则必须在 ______ 上安装一个存水弯（trap）。
8.Which compressor type is most suitable for use with R-22 refrigerant?
8.哪种类型的压缩机最适合与 R-22 制冷剂配合使用？
9.A “dry well” is best described as:
9.“干井”（Dry well）的最佳描述是：
10.A cooling tower operates with which type of pump?
10.冷却塔通常配合哪种类型的泵运行？
