速度继电器主要作用于电动反接制动,所以也称为反接制动继电器。...
Sunday, September 11, 2022
当证明变压器的自动跳闸不是由于其内部故障引起的,而是由于()引起...
Friday, September 16, 2022
在FX<sub>2N</sub>系列PLC中,T200的定时精度...
Friday, September 16, 2022
Friday, September 16, 2022
西门子MM440变频器可外接开关量,输入端⑤—⑧段作为多段速给定端,可预置()不同的给定频率值。A、15个B、16个C、4个D、8个...
Saturday, April 29, 2023
Thursday, September 15, 2022
在三相四线的架空线路中角钢横担应至少为()A、L40×5B、L50×6C、L65×8...
Tuesday, April 9, 2024
Friday, September 16, 2022
静差率又称静差度或速度的稳定度,表示负载转矩变化时()变化的程度...
Friday, September 16, 2022
Friday, September 16, 2022
PLC控制系统具有()功能,能查出自身故障,随时显示给操作人员。...
Sunday, September 11, 2022
Sunday, September 11, 2022
Friday, September 16, 2022
根据三极管内PN结的单向导电性,如果正反向电阻都为(),说明其内...
Friday, September 16, 2022
仪用互感器运行中,一次电压和一次电流不得超过互感器额定值的()...
Sunday, September 11, 2022
Friday, September 16, 2022
相位伏安表将旋转开关至U1U2两路电压信号从两路电压输入插孔输入...
Friday, September 16, 2022
Sunday, September 11, 2022
Friday, September 16, 2022
Sunday, September 11, 2022