灯丝电路的具体供电是
A.总电源B.限时器C.高压发生器D.磁饱和稳压器E.容量保护电路
参考答案:D
解析:管电流调整电路也称灯丝电路,它由稳压器供电。
So much ______ by the poem for the Wenchuan earthquake that he decided to participate in the re-construction of the damaged region.
A.did he move
B.he moved
C.was he moved
D.he was moved
《环境噪声污染防治法》规定,在城市市区范围内,建筑施工过程可能产生噪声污染,施工单位须在开工()以前向所在地县以上环境行政主管部门申报该工程采取的环境噪声污染防治情况。
A.10天
B.15天
C.20天
D.30天