中国药典中既对药品具有鉴别意义，也能反映药品的纯杂程度的项目是( )
A．物理常数
B．鉴别
C．检查
D．含量测定
E．外观
参考答案：A
A conductor was invited to keep us_________in the singing at the School Art Festival.
A．in common
B．in advance
C．in time
D．in return
经前小腹灼痛拒按，伴腰骶胀痛，经色黯红，质稠，有血块，中医辨证为：
A．肝肾虚损B．气血虚弱C．湿热下注D．寒湿凝滞E．阳虚内寒
