皮皮学，免费搜题
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【单选题】
抗瘤谱广，是治疗实体肿瘤的首选药的是A.
阿糖胞苷
B.
甲氨喋呤
C.
两者均是
D.
两者均不是
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皮皮学刷刷变学霸
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【单选题】下列各组向量中互相垂直的一组是( )
A.
a=(3,-1),b=(-3,1)
B.
a=(-3,4),b=(4,3)
C.
a=(2,3),b=(-2,-3)
D.
a=(2,-3),b=(3,-2)
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