若对于任意的实数,不等式|x+1|≥kx恒成立,则实数k的取值范围是( )
[0,1]
—What's you_____?
—It's cindy 2010@163. com. [ ]
A. telephone number
B. first name
C. ID card number
D. e-mail address
罕有单侧肺门影增大的病变是()
A.中央型肺癌
B.肺动脉瓣狭窄
C.肺动静脉畸形
D.组织胞浆菌病
E.淋巴瘤