通信电源集中监控管理系统的功能可分为（）功能，（）功能，（）功能，（）功能以及（）功能等五个方面。
参考答案：监控；交互；管理；智能分析；帮助
Walter offered us a lift when he was leaving the office, but our work ______, we didn’t accept the offer.
A．not being finished
B．having not been finished
C．had not been finished
D．not having finished
正常分层注水井每（）测试1次，分层测试资料使用期限不超过（）月。
