属于抗生素类抗癌药物的是()。
A.卡铂
B.环磷酰胺
C.氟尿嘧啶
D.阿霉素
E.长春新碱
参考答案:D
The boy _____ is playing the piano is a friend of mine. [ ]
A. whose
B. who
C. whom
D. which
UPS电源5#、7#、8#亮并伴有鸣叫声,是何原因?