1.For a 60,000 BTU/hr gravity furnace, the smallest air supply duct required is:
1.对于一台 60,000 BTU/hr 的重力式暖气炉，所需的最小送风管道尺寸为：
2.No. 1 fuel oil is clear, very ______, and similar in appearance to kerosene.
2.1号燃油呈透明状，非常______，且外观与煤油相似。
3.A rectangular duct measuring 30＂ × 10＂ should be fabricated from:
3.尺寸为 30\" × 10\" 的矩形管道应使用何种规格的金属板材制作？
4.Smaller boiler systems (10,000 lb/hr or less) often use underfeed stokers where fuel is pushed in by a ram or ______.
4.较小的锅炉系统（10,000 lb/hr 或以下）常采用下饲式加煤机，其中燃料通过推杆或______推入。
5.The minimum clearance for ducts carrying flammable dust is:
5.输送可燃粉尘的管道，其最小安全间距为：
6.The maximum strap spacing for horizontal duct runs is:
6.水平敷设管道时，吊带（支架）的最大间距为：
7.Grease ducts must have what type of seam construction?
7.排油烟管道（Grease ducts）必须采用何种类型的接缝结构？
8.A salesperson earning 5% commission on $220,000 in AC sales would make:
8.一位销售员在 220,000 美元的空调销售额中获得 5% 的佣金，其收入将是：
9.Among solid fuel combustion systems, the most recognized and widely used are ______.
9.在固体燃料燃烧系统中，最受认可且应用最广泛的是______。
10.For a room with a 1200 sq. ft. ceiling, requiring 1 sq. ft. of register per 150 sq. ft., the smallest register needed is:
10.对于一间天花板面积为 1200 平方英尺的房间，若要求每 150 平方英尺面积配备 1 平方英尺的送风口，则所需的最小送风口尺寸为：
