There ____________ many children in the classroom. [ ]
A. is
B. are
C. aren't
答案:B
极量()
A.青霉素V
B.苯唑西林
C.替卡西林
D.哌拉西林
E.舒巴坦
客户融资买入证券时,融资保证金比例不得低于( )。
A.15%
B.20%
C.30%
D.50%