According to Dr William Cohn, the artificial heart______.A．mimics the action of the heart

According to Dr William Cohn, the artificial heart______.

A．mimics the action of the heart found in humans

B．provides the blood flow of a natural human heart

C．produces pulses by a continuous-pump mechanism

D．uses a small spinning turbine to keep blood flowing at a steady rate

请帮忙给出正确答案和分析，谢谢！

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