She usually buys CDs her favourite singers. [ ]
A. by
B. on
C. with
D. and
答案:A
沿声束轴向测量的被探测物与探头间的距离称为()
A.声场区
B.范围
C.间期
D.厚度
E.宽度
王清任认为:治病之要诀,在明白()
A.脏腑
B.经络
C.气血
D.津液
E.阴阳