文法S→aaSabc定义的语言是()
A.{a2kbc|k>0}
B.{akbc|k>0}
C.{a2k-1bc|k>0}
D.{akakbc|k>0}
参考答案:D
To read Tolstoy and ____ to the nineteenth century Russian literature are two excellent reasons for taking Professor Morrel’s course.
A.to introduce
B.introduce
C.being introduced
D.to be introduced
对企业投标项目实现“核准制”或“备案制”,属于政府对投资项目的( )管理。
A.分级
B.分段
C.分类和分项目
D.分规模