金融机构标识码共（）位。
A.10
B.12
C.14
D.16
参考答案：B
—When should we leave for Paris?
—________. Any time is OK with me.[ ]
A. You have the choice
B. It's up to you
C. I don't care
D. Never mind
下列物质中氮元素化合价最低的是 [ ]
A.N2
B.NH3
C.NO2
D.HNO3
