x2+2x=0.
由原方程,得
x(x+2)=0,
则x=0或x+2=0,
解得,x1=0,x2=-2.
_____ the stress and pressure from her job, she bore the burden of caring for her sick mother. [ ]
A. As well as
B. As long as
C. As far as
D. As soon as
诊断急性白血病最有意义的外周血异常是()。
A.白细胞计数2×109/L
B.白细胞计数20×109/L
C.原始细胞27%
D.分叶核粒细胞>89%
E.血小板少见