-- you a clock in your bedroom?
-- No, I don't.
A:Are; have
B:Do; has
C:Are; has
D:Do; have
已知△ABC为等边三角形,AB=2.设点P,Q满足 AP→=λAB→ , AQ→=(1−λ)AC→ ,λ∈R.若 BQ→⋅CP→ =﹣ 32 ,则λ=( )
点1,-1到直线3x-4y+3=0的距离为( )
①减缓人口老龄化的进程 ②提高人口素质 ③保持合理的劳动力数量 ④改变中国人口负增长现状