()是指招标人以招标公告方式邀请不特定的法人或者其他组织投标。
参考答案:公开招标
若等差数列{an}的前5项之和S5=25,且a2=3,则a7=( )
A.12
B.13
C.14
D.15
—Where is your mother, Rita?
--___________________.
A.She has been to Wu hu.
B.She’s going to the old people’s home
C.She’s gone to work
D.She’ll go shopping