1.What is another name commonly used for Freon R-12?
1.氟利昂 R-12 常用的另一个名称是什么？
2.The correct oil level in a compressor sight glass is:
2.压缩机视油镜中正确的油位应为：
3.The smallest access opening allowed for a furnace installed in an attic is:
3.对于安装在阁楼内的暖气炉，允许的最小检修口尺寸为：
4.The tool that measures air movement directly in FPM is the:
4.能够直接测量空气流速（单位：FPM）的工具是：
5.DuPont markets its R-134a refrigerant under the trade name ______.
5.杜邦公司（DuPont）以商标名称 ______ 销售其 R-134a 制冷剂。
6.Which refrigerants can safely be mixed together?
6.下列哪几种制冷剂可以安全地混合使用？
7.The two primary chilled water distribution configurations are:
7.两种主要的冷冻水分配配置是：
8.Air grilles may be located:
8.通风口可以位于：
9.The work needed to achieve a specific refrigeration effect increases when the temperature level to which heat is transferred from the cold source is ______.
9.当从冷源传递热量的目标温度升高时，达到特定制冷效果所需的功会_____。
10.The smallest permissible diameter for a condensate drain line is:
10.冷凝水排水管的最小允许直径是：
