1.Field cleaning of heat exchangers to remove scale and deposits may involve:
1.对换热器进行现场清洗以去除结垢和沉积物时，可能涉及：
2.What is the highest acceptable level of carbon monoxide inside a building?
2.建筑物内部允许的最高一氧化碳浓度是多少？
3.The detection of ______ is a sign of incomplete combustion.
3.检测到 ______ 是不完全燃烧的迹象。
4.The maximum length allowed for a duct vibration isolator is:
4.风管隔振接头的允许最大长度为：
5.The material that provides the least insulation per thickness is:
5.在单位厚度下，提供隔热效果最差的材料是：
6.Which of the following materials provides the greatest thermal insulation?
6.以下哪种材料提供的隔热效果最好？
7.It is recommended to install suction-side ______ in oil systems to filter out debris that could harm the pump.
7.建议在油路系统的吸入口侧安装 ______，以滤除可能损坏泵的杂物。
8.Type A vents are specifically designed for:
8.A 型排气管是专门为 ______ 设计的。
9.For the same wall (R = 1.9, 7.9, 2.9, 7.9), the total thermal conductance equals:
9.对于同一面墙（R 值分别为 1.9、7.9、2.9、7.9），其总热导率等于：
10.Why is a strainer used to protect regulators and control devices?
10.为什么要使用粗滤器（Strainer）来保护调节器和控制装置？
