A:to blame; occurred
B:to blame; occurring
C:to be blamed; occurred
D:to be blamed; occurring
关于大气水平运动的叙述,正确的是( )
砷化镓(GaAs)是一种“LED”绿色节能光源材料,镓元素的相关信息如图。下列有关镓的说法错误的是( )