城市消防远程监控系统中，对用户信息传输装置的主用电源和备用电源进行切换试验，（    ）。

A、<p><span style=" font-family: 宋体;">每半年的试验次数不少于</span><span style="font-family: \'Microsoft YaHei\'; ">1</span><span style=" font-family: 宋体;">次</span></p>

B、<p><span style=" font-family: 宋体;">每季度的试验次数不少于</span><span style="font-family: \'Microsoft YaHei\'; ">1</span><span style=" font-family: 宋体;">次</span></p>

C、<p><span style=" font-family: 宋体;">每月的试验次数不少于</span><span style="font-family: \'Microsoft YaHei\'; ">1</span><span style=" font-family: 宋体;">次</span></p>

D、<p><span style=" font-family: 宋体;">每年的试验次数不少于</span><span style="font-family: \'Microsoft YaHei\'; ">1</span><span style=" font-family: 宋体;">次</span></p>

A、<p><span style=" font-family: 宋体;">每半年的试验次数不少于</span><span style="font-family: 'Microsoft YaHei'; ">1</span><span style=" font-family: 宋体;">次</span></p>

B、<p><span style=" font-family: 宋体;">每季度的试验次数不少于</span><span style="font-family: 'Microsoft YaHei'; ">1</span><span style=" font-family: 宋体;">次</span></p>

C、<p><span style=" font-family: 宋体;">每月的试验次数不少于</span><span style="font-family: 'Microsoft YaHei'; ">1</span><span style=" font-family: 宋体;">次</span></p>

D、<p><span style=" font-family: 宋体;">每年的试验次数不少于</span><span style="font-family: 'Microsoft YaHei'; ">1</span><span style=" font-family: 宋体;">次</span></p>