治疗慢性粒细胞性白血病，首选（）
A.二溴甘露醇
B.长春新碱
C.靛玉红
D.环磷酰胺
E.羟基脲
参考答案：E
People used to think beauty was _____and that different cultures had different preferences.[ ]
A. ample
B. arbitrary
C. antique
D. apparent
独头供风长度大于（）时宜考虑设增压风站。
A.1000m
B.2000m
C.3000m
