已知二元一次方程3x-2y=1,若x=1时,y=______.
把x=3代入方程3x-2y=1,
得3×1-2y=1,
解得y=1.
________ Christmas Day,we often eat a turkey.[ ]
A. On
B. In
C. At
D. For
与长期口服避孕药有关的肝肿瘤是()
A.肝局灶结节增生
B.肝腺瘤
C.肝血管瘤
D.肝细胞肝癌
E.肝内胆管癌