Jack was born ___________ May 5th, 1980.[ ]
A. in
B. at
C. on
D. /
答案:C
朱砂的功效是()
A.安神解毒
B.纳气定喘
C.平肝潜阳
D.利尿通淋
E.清心镇惊
对光接入网中单星形和双星形的运用前途.正确的是().
A.单星形比双星形更有前途
B.双星形比单星形前途更大
C.单星形和双星形前途一样