请指出圆圈所画部位为听诊有何异常（）.
A.第一心音增强
B.第一心音减弱
C.窦性心律不齐
D.第一心音强弱不等
E.生理性杂音
参考答案：D
There aren't enough chairs. Would you please _____ ones here?[ ]
A. to bring another three
B. bring more three
C. to take three other
D. bring three more
根据液体的连续性流动方程式，下面公式正确的是（）
A、V1/V2=A1/A2
B、V1/V2=A2/A1
C、V1XV2=A1×A2
C、V1XV2=A2×A1
