腹腔镜手术与开放性手术相比,其主要优势有()。
A.住院时间短
B.术后恢复快
C.切口瘢痕小
D.镇痛药物使用少
E.切除肿瘤更完全
参考答案:A, B, C, D
(2013·福建,27)The book tells stories of the earthquake through the eyes of those ________ lives were affected.
A.whose
B.that
C.who
D.which
先化简: (2x-1)2-(3x-1)(3x+1)-5x(1-x),再选取一个你喜欢的数代替x求值。