题干
— Will robots do our homework?
— ____________. （ ）
A：No, they won't
B：Yes, they will
C：Yes, they won't
答案(点此获取答案解析）
A
— Will robots do our homework?
— ____________. （ ）
A：No, they won't
B：Yes, they will
C：Yes, they won't
为互相垂直的单位向量
，
且
的夹角为锐角，实数
的取值范围是（ ）