问题
多项选择题
发电机失磁的现象()。
A、发电机励磁电流显示等于或接近零。发电机无功指示负值;
B、发电机有功负荷可能降低并摆动,功率因数表指向进相;
C、发电机电压下降,定子电流升高,并且呈同期性摆动;
D、DCS内失磁保护动作光字牌亮,事故音响响。
答案
参考答案:A, B, C, D
发电机失磁的现象()。
A、发电机励磁电流显示等于或接近零。发电机无功指示负值;
B、发电机有功负荷可能降低并摆动,功率因数表指向进相;
C、发电机电压下降,定子电流升高,并且呈同期性摆动;
D、DCS内失磁保护动作光字牌亮,事故音响响。
参考答案:A, B, C, D
根据短文内容,完成所给任务。 Four notes Mr and Mrs Brown have two children: Mike and Liz. The whole family are all busy, so they often leave notes for each other. Look at these four notes of today.
小题2: should walk the dog today. 小题3:Mike is doing his at 6:45 pm. 小题4:Mike’s tennis shoes are the back door. 小题5:According to the notes. Teddy is the in the family. |