问题
单项选择题
按通信电源系统直流连接导线的颜色规定，单相交流输入相线的颜色为（）。
A.橙色（或红色）
B.蓝色（或黑色）
C.黄色
D.绿色
答案
参考答案：A
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按通信电源系统直流连接导线的颜色规定，单相交流输入相线的颜色为（）。
A.橙色（或红色）
B.蓝色（或黑色）
C.黄色
D.绿色
参考答案：A
| 先通读对话，掌握其大意，然后从所给的选项中选出最佳选项。 | ||
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