共鸣火花电疗法属于()。
A.长波电流
B.中波电流
C.短波电流
D.微波电流
E.超短波电流
参考答案:A
Unless _____ to speak, you should remain silent at the conference. [ ]
A. invited
B. inviting
C. being invited
D. having invited
中央税与地方税划分的标准有:(1)();(2)();(3)()。