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问题 多项选择题

食管超声心动图的用途有()

A．心功能监测

B．心内气栓诊断

C．估价心局部功能，早期诊断心肌缺血

D．异常、黏液瘤和血栓诊断

E．诊断心脏解剖畸形

答案

参考答案：A, B, C, D, E

单项选择题

The CAPM is an:（）

A. equilibrium model that predicts the expected return on a stock given the expected return on the market and the stock’s correlation coefficient.

B. equilibrium model that predicts the expected return on a stock given the expected return on the market and the stock’s covariance.

C. equilibrium model that predicts the expected return on a stock given the expected return on the market and the stock’s beta coefficient.
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单项选择题

电压互感器的误差与二次负载的大小有关，当负载增加时，相应误差（）。 

A、将增大

B、将减小

C、可视为不变

D、有变化
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