变压器的经济运行方式是使其本身及电力系统有功损耗最小，能获得最佳经济效益的运行方式。
参考答案：对
根据投资者对收益和风险的共同偏好以及投资者个人偏好确定投资者最优证券组合并进行组合管理的方法是（）。
A.基本分析法
B.技术分析法
C.证券组合分析法
D.金融工程法
(2013·河北石家庄二模)—________ has brought worldwide attention to China?
—Rapid and steady economic growth, of course.
A．What do you think it is
B．What do you think is it
C．What do you think it is that
D．What do you think is it that
