1.A(n) ______ is used during winter to introduce moisture into heated air within a furnace system.
1.在冬季，______ 用于向炉式供暖系统内的加热空气中注入水分。
2.The duct configuration illustrated in the drawing is best identified as which system type?
2.图中所示的风管布局最符合哪种系统类型？
3.R-115 is most often used in:
3.R-115 最常用于：
4.Ductwork should maintain a balance between supply and return airflow to ensure_____within the conditioned area.
4.风管系统应保持送风与回风气流之间的平衡，以确保受控区域内维持 ____。
5.Compressor displacement depends on which of the following factors?
5.压缩机的排气量取决于以下哪个因素？
6.An air conditioner accessory that monitors outdoor conditions and allows outside air to enter or mix with conditioned air is called a ___.
6.一种用于监测室外环境状况，并允许室外空气进入或与处理后的空气混合的空调辅助装置，被称为 ___。
7.Freon refrigerants are generally colorless and nearly ______.
7.氟利昂制冷剂通常无色且几乎 ______.
