在标志寄存器F中,CY=0,S=1分别表示()。
A.运算结果有进位,为正
B.运算结果有进位,为负
C.运算结果无进位,为正
D.运算结果无进位,为负
参考答案:A
It is difficult to________one twin from the other.They almostdon't________from each other. [ ]
A. differ; distinguish
B. distinguish; different
C. distinguish; differ
D. tell; different
绿豆象身体();触角11节,雄虫梳齿状,雌虫锯齿状;前胸背板圆锥形,后缘中央有两个并列的长椭圆形瘤状突起,上面密被白色茸毛。
A.近卵形
B.扁椭圆形
C.扁圆筒形
D.扁长方形