下列按按征税对象性质分类的是（）
A.流转税
B.所得税
C.资源税
D.关税
参考答案：A, B, C
Communication along with information industry _____ an important part in modern times.[ ]
A. play
B. plays
C. have played
D. are playing
热继电器在电路中具有（）保护作用。
A.过载
B.短路
C.失压
