A:细胞壁
B:细胞膜
C:液泡
D:细胞核
关于x的一元二次方程x2﹣2x+m=0有两个实数根,则m的取值范围是____
通常,一天中气温最高的时刻最可能出现在( )
the money the government offered, the pupils in the poor area could go back to school again.