"Would you like _______ milk?" "No, thanks." [ ]
A. many
B. any
C. some
D. a lot
答案:C
设α,β,γ都是非零向量,α×β=α×γ,则()。
A.β=γ
B.α∥β且α∥γ
C.α∥(β-γ)
D.α⊥(β-γ)
简述按港口生产安全事故类型辨识的危险有害因素。