脱疽初起，患者趺阳脉的脉象多表现为（）
A.弦数
B.洪大
C.结代
D.微弱
E.绝
参考答案：D
She was often late for school, ___ made her teacher very angry.
A．that
B．it
C．which
D．what
直读法测量相位的原理是什么？
