How nervous we are ________ the coming high school entrance exams _______ June 15th!
A:thinking of ; on
B:to think of; on
C:thinking of ; in
D:to think of; in
读青藏地区图,回答下列问题。
计算a2•a5的结果是( )
已知a→=1,b→=3,<a→,b→>=60°,(a→-c→)(b→-c→)=0,则c→的最小值是( )