一本数学课外书的宽与长的比恰好是黄金比,如果书的长是20cm,则这本书的宽约为[ ]
A、7.6cm
B、12.4cm
C、32.3cm
D、10.4cm
答案:B
—Must I return the book this morning?
—No, you . But you return it before supper. [ ]
A. needn't; must
B. mustn't; can
C. mustn't; may
D. can't; need
计算该患者烧伤面积为
A.48%
B.53%
C.59%
D.65%
E.68%