1.A fan delivering 15,000 cfm at 600 rpm must run at what speed to supply 20,000 cfm?
1.一台在 600 rpm 转速下输送 15,000 cfm 风量的风机，若要输送 20,000 cfm 的风量，其运行转速应为多少？
2.Fuel-air control equipment is classified into three categories:
2.燃料-空气控制设备通常分为哪三类？
3.Which component is specifically used to regulate the quantity of airflow?
3.哪种组件是专门用于调节气流量的？
4.High-efficiency furnaces improve fuel utilization by incorporating a ______ heat exchanger configuration.
4.高效炉通过采用______的热交换器结构来提高燃料利用率。
5.In HVAC terminology, a mechanical unit that circulates air throughout a conditioned area is called a/an __.
5.在 HVAC（暖通空调）术语中，用于在空调区域内循环空气的机械装置被称为______。
6.A primary byproduct of solid-fuel boiler operation is ______.
6.固体燃料锅炉运行产生的主要副产物是______。
7.A calculating device made up of sliding scales that assists in determining duct sizes for air distribution is referred to as a ___.
7.一种由滑动刻度尺组成的计算工具，用于辅助确定空气分配管道的尺寸，被称为______。
8.The three main functions of an HVAC system in a building are:
8.建筑物中 HVAC 系统的三大主要功能是：
9.For residential HVAC cooling system design, the typical mean indoor temperature should be ___°F.
9.在住宅 HVAC 制冷系统的设计中，典型的室内平均温度应设定为______°F。
10.Oxygen ______ systems are widely regarded as the most accurate method for improving control performance.
10.______氧气系统被广泛认为是提高控制性能最准确的方法。
