中国移动智能能耗采集系统的建设方式优先选择（）
A、与电力部门共建共享
B、单独建设
C、合同能源管理
D、暂不建设后期改造
参考答案：A
在△ABC 中，“B=60°”是“A，B，C 成等差数列”的 ______条件（指充分性和必要性）．
The senior senator has in the past three terms both experienced the sweet taste of success and the bitterness of defeat in his legislation fights with his opponents.
A．both experiences
B．experiences both
C．experience both
D．experienced both
