E70高保真音响放大器（HiFi）连接在哪条总线上？（）
A. MOST
B. K-CAN
C. F-CAN
D. 无
Navigation lights must be displayed in all weathers from sunset to sunrise. They also（）.
A. must be displayed when day signals are being used
B. must be displayed when moored to a pier
C. may be extinguished at night on open waters when no other vessels are in the area
D. may be displayed during daylight
国家电网公司土建设施检修策略中，围墙基础的实际状态及其检修策略是什么？
水利水电施工现场各类警示标志的设置应与存在的危险因素相符，设置位置应处于视觉容易识别的明显之处。
A. 正确
B. 错误
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