失业的深层次原因有哪些?
参考答案:
市场经济规律的作用;劳动力市场不完善;产业结构调整.
—Can I help you,sir?
__Yes,please.I’d like a room with a _____for two nights, please.
A.scene
B.scenery
C.sight
D.view
与乳腺癌相关性最好的肿瘤标志物是
A.AFP
B.CEA
C.CA125
D.CA15-3
E.PSA