在一列数1,2,3,4,…,200中,数字“0”出现的次数是( ) [ ]
A.30个
B.31个
C.32个
D.33个
答案:B
—Thanks for giving me ___________I wanted.
—You are welcome. [ ]
A. the information
B. an information
C. the informations
D. information
自动调节系统可分哪几类?