计算:4×(-3)2-15÷(-3)-50.
原式=4×9-15÷(-3)-50
=36+5-50
=-9.
Look, Wang Bing is stopping David. He's ____ David. [ ]
A. in front of
B. behind
C. between
哪一条不是针对康复的治疗()
A.康复工程
B.临床护理
C.中国传统康复治疗
D.言语治疗
E.矫形手术治疗