1.Which statement correctly compares the operating voltage of cold electrodes and hot cathodes in sign tubes?
1.以下哪项正确比较了招牌灯管中冷电极和热阴极的工作电压？
2.Which screw size is generally uncommon for the fabrication and installation of electrical signs?
2.以下哪种螺钉尺寸通常不常用于电气招牌的制作和安装？
3.Which type of glass is generally easier to fabricate and work with when producing sign tubes?
3.制作招牌灯管时，哪一种玻璃通常更容易加工和处理？
4.A tube cork designated as size “000” is intended for tubing with which outside diameter?
4.标记为“000”规格的灯管塞（Tube Cork），适用于哪种外径的灯管？
5.Which electrical device is used in a sign circuit when only a DC power source is available?
5.当招牌电路只有直流（DC）电源可用时，应使用哪种电气设备？
6.For a cold-cathode sign power supply or transformer rated at an output current greater than 50 mA, what is the minimum required efficiency?
6.对于额定输出电流大于 50 mA 的冷阴极招牌电源或变压器，其最低要求效率是多少？
7.For a cold-cathode sign power supply or transformer rated at an output current below 50 mA, what is the minimum required efficiency?
7.对于额定输出电流低于 50 mA 的冷阴极招牌电源或变压器，其最低要求效率是多少？
8.Which of the following is a primary consideration when establishing the criteria for an electrical sign project?
8.制定电气招牌项目标准和要求时，以下哪一项是首要考虑因素？
9.What is the primary purpose of reviewing plans and specifications before beginning sign construction?
9.开始招牌施工之前审查施工图纸和规格说明的主要目的是什么？
10.Which of the following should be considered when engineering and designing a sign?
10.在进行招牌工程设计和设计规划时，以下哪项需要考虑？
