硬磁材料是指材料的（）
A．磁导率低；
B．剩磁强；
C．矫顽力大；
D．以上都是
参考答案：D
Mr Green, there is someone at the front desk ______ would like to speak with you. [ ]
A. he
B. who
C. which
D. whom
肾虚脚气宜选用：（）
A.防己黄芪汤
B.二妙散
C.鸡鸣散
D.肾气丸
E.萆薢分清饮
