肺腺癌时常升高的肿瘤标志物是()
A.NSE
B.CA129
C.CYFRA21-1
D.CEA
E.ADA
参考答案:D
My brother likes going skating _____ winter. Skating is his favorite sport.[ ]
A. to
B. in
C. on
D. at
试分析表面安装元器件有哪些显著特点。