单项选择题

用来描述测试装置动态特性的传递函数与频率响应函数之间没有联系。（）

A．对
B．错

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多项选择题

The advantage of HHI includes( ): A.
The HHI increases as the market shares of a given number of firms become less equal. B. Data on all firms in the industry are used to calculate the HHI. C.
HHI is very sensitive to the market shares of the largest firms due to the squaring of market shares. D.
The rest of the choices are wrong

单项选择题

因为煤在早期会排出酸性水而使砂体发生部分溶解作用,因此,煤系地层中的砂体渗透率一般较高。这种说法是否合理_______?( )。
A、是
B、否