待用间隔应有（），并列入调度管辖范围。
A、名称
B、防误装置
C、必要的安全设施
D、编号
参考答案：A, D
用所给单词的正确形式填空，完成短文。
Confucius (孔子) 1_______________ (be) a wise man and a teacher. He 2_______________ (live) in
Shandong. He 3_______________ (go) to many places and 4_______________ (teach) many students and
5_______________ (write) many books. He 6_______________ (be) very famous all over the world now.
安防系统的电源质量应满足下列要求：稳态频率偏移不大于（）Hz.
A、±0.1
B、±0.2
C、±0.3
D、±0.5
