单项选择题

关于五类模拟原型滤波器的性能比较，错误的是：
A、巴特沃斯滤波器过渡带最宽
B、契比雪夫滤波器通带或阻带有波动，整体性能次于巴特沃斯滤波器
C、椭圆滤波器通带阻带均有波动，过渡带最窄，性价比最高
D、贝塞尔滤波器具有线性相位

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信息化社会使生活方式从物理的、静态的转变成数字的、移动的、虚拟的以及个性的。

A．对
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A school changes its stationery suppliers to save money, and increases class sizes. As a result the latest set of exam results are lower than previous years.
How has the school performed in terms of the value for money framework?

A．Well on economy and efficiency, but at the cost of effectiveness
B．Well on efficiency, but not well with economy or effectiveness
C．Well on efficiency and elasticity, badly on effectiveness
D．Well on effectiveness and economy, but badly on efficiency