便血脾胃虚寒型的主方为（）
A.归脾汤
B.黄土汤
C.知柏地黄汤
D.桑杏汤
E.黄芪建中汤
参考答案：B
He said that the key _____ to open the door had been lost.
A．with what
B．with it
C．with that
D．with which
CT图像的质量参数不包括（）
A.扫描视野
B.部分容积效应
C.空间分辨力和密度分辨力
D.噪声与伪影
E.周围间隙现象
