邓 * * 理论的精髓和核心是( )。
A．解放思想、实事求是
B．坚持党执政
C．以经济建设为中心
D．坚持四项基本原则
参考答案：A
----You look pale and upset.
----Yes, my girl friend _____ an online chat with me non-stop until six o’clock this morning.
A．have been having
B．had had
C．was having
D．am having
正常运行中怎样调节发电机的有功及无功功率？有功、无功功率变化时相互间有什么影响？
