分导体()
A.干皮肤、骨、皮下脂肪
B.淋巴液、脑脊液、血液
C.肌肉、汗腺、肝、脑、肾
D.干头发、指甲
E.牙齿
参考答案:A
I'm sure you'd rather she went to school by bus, ?
A.hadn't you
B.wouldn't you
C.aren't I
D.didn't she
请简述XPON系统的DBA的定义及功能?