1.Infrared heating systems provide users with full ______ when heating structures.
1.红外加热系统在对建筑物进行加热时，能为用户提供完全的 ______。
2.In a house without air conditioning, how should you adjust the fan limit control during summer?
2.在没有空调的房屋中，夏季应如何调节风机限位控制器？
3.In a gravity warm-air system, the furnace should be placed:
3.在重力式暖风系统中，暖风炉应放置在：
4.Gas-fired infrared heaters share many benefits similar to ______ powered units.
4.燃气红外加热器具有许多与 ______ 驱动设备相似的优点。
5.Why is a warm-air register usually installed below a window?
5.暖风送风口（寄存器）通常为何安装在窗户下方？
6.A warm-air furnace located in an attic or crawl space must have a minimum clearance of:
6.安装在阁楼或爬行空间内的暖风炉，其周围必须留出至少 ______ 的净空距离。
7.Installing snow-melting piping deeper in concrete requires ______ heat since more material must be warmed.
7.若将融雪管道埋设在混凝土中较深的位置，则需要 ______ 的热量，因为必须加热更多的材料。
8.Which of the following is not considered when determining air-conditioning needs?
8.在确定空调需求时，下列哪项因素通常不予考虑？
9.“Superheat” refers to:
9.“过热度”（Superheat）是指：
10.Infrared heaters can operate using either ______ gas or propane.
10.红外加热器可使用 ______ 燃气或丙烷作为燃料运行。
