解方程:4x2-x-1=3x-2
解:
In order to find the missing child, villagers all they can over the past five hours.
A.did
B.do
C.had done
D.have been doing
血小板过少且释放功能障碍时( )
A.出血时延长B.出血时缩短C.凝血时延长D.凝血时缩短E.凝血时与出血时都延长