公安工作信息化的基本特征是什么？
参考答案：
①信息数字化；②流程网络化；③指挥一体化；④处警协同化；⑤服务一站化；⑥预警智能化。
I was ill that day . Otherwise , I ________ the meeting . [ ]
A. should attend
B. could attend
C. would have attended
D. must have attended
采用交流伺服电动机的伺服系统称为交流伺服系统。
