患者心悸。查体：心律完全不规则，心率快慢不等，心音强弱绝对不一致，脉搏短绌。应首先考虑的是（）

A．窦性心律不齐

B．房性早搏

C．心房纤颤

D．房室交界性早搏

E．室性早搏

(71) , the brains of a computer, it contains the ALU, the clock, many registers, the bus interface, and circuitry that makes these pans work together.

A. I/O device


B. CPU
C. Memory



D. Operating system