更多"[单选题]医用中电频电流的频率范围是( )。"的相关试题:
[单选题]医用高频电流的频率范围是( )。
A. 1kHz以上
B. 10kHz以上
C. 100kHz以上
D. 1000kHz以上
E. 1MHz以上
[单选题]医用低频电流的频率范围是多少Hz?( )
A. 0~100Hz
B. 0~1000Hz
C. 0~10000Hz
D. 0~100000Hz
E. 0~1000000Hz
[单选题] 工频耐压试验时试验电源的频率只要在（）范围内即认为符合工频耐压要求。
A. 20-45Hz
B. 35-45Hz
C. 45-65Hz
[单选题]183/1137 工频耐压试验时试验电源的频率只要在（）范围内即认为符合工频耐压要求。
A.A：.20-45Hz
B.B：.35-45Hz
C.C：.45-65Hz
[判断题]843/1137 工频耐压试验时试验电源的频率只要在45~65Hz范围内即认为符合工频耐压要求。
A.正确
B.错误
[判断题]84 工频耐压试验时试验电源的频率只要在45~65Hz范围内即认为符合工频耐压要求。
A.正确
B.错误
[判断题]就电击而言，工频电流是危险性最小的电流。因此，普遍采用这种频率的电源。
A.正确
B.错误
[判断题]一般情况下，GIS的电源频率为50或60Hz，此时测试仪使用内同步方式，如果GIS的电源频率不是50/60Hz，那就要使用外同步方式。
A.正确
B.错误
[单选题]
某甚高频电台工作频率范围是118MHz～136.975MHz，
该电台可提供25kHz频率间隔的信道总数是____。
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[单选题]电子测量的频率范围极宽,其频率低端已进入( )量级。
A.~Hz
B.~Hz
C.~Hz
D.~Hz
