空调设备的电气绝缘应大于MΩ。()
A、2MΩ
B、3MΩ
C、5MΩ
参考答案:A
艾菲尔铁塔所属的国家在下列哪个地区[ ]
A、东南亚
B、中东
C、欧洲西部
D、撒哈拉以南的非洲
A portfolio of options had a return of 22 percent with a standard deviation of 20 percent. If the risk - free rate is 7.5 percent, what is the Sharpe ratio for the portfolio()
A. 0.725.
B. 0.147.
C. 0.267.