The city is famous _____ its fine parks. [ ]
A. of
B. to
C. for
D. as
C
下列哪种规范可以授权行政机关自行强制执行?()
A.法律
B.行政法规
C.地方性法规
D.规章
石英长水口为何不适应20MnSi钢种?