【单选题】YL —335B自动化生产线使用的电磁阀电压是( )。
【单选题】--- Oh, Jack’s not here these days. Is he ill? ---________. His mother told me that he was in hospital.
【单选题】He's tooto think of lending me his car.
【简答题】TW-2型驼峰自动化控制系统,供雷达和传感器使用的电源为直流()V。
【判断题】水力警铃是利用水流的冲击力发出声响的报警装置,一般安装在延时器之后。()