一个两位数,十位上的数字为m,个位上的数字为n,则这个两位数是 [ ]
A.mn
B.10m+n
C.m+n
D.10mn
答案:B
偏瘫患者进行床-轮椅之间的转移时轮椅放在健侧,与床成夹角是()。
A.<30°
B.30°~45°
C.40°~45°
D.45°~50°
E.50°~60°
My cell-phone has disappeared. Who ____ have taken it away?[ ]
A. could
B. should
C. must
D. might