答案:B
—Is it possible(可能的)that we will be late for the first class?
— .[ ]
A. I hope it
B. I think it
C. I’m afraid so
D. I hope so
对于实数λ≠0,非空向量及零向量,下列各式正确的是().
A.选项A
B.选项B
C.选项C
D.选项D