—No, I _______ it for 2 years.
A: had
B: have had
C: bought
D: have bought
小王的母亲领取了8000元工资后,在商店里购买一件打折商品,原标价为人民币1000元,实际支付800元。在这里,8000元、1000元、800元分别执行的职能是( )
已知随机变量ξ服从正态分布N(2,σ2),P(ξ≤4)=0.84,则P(ξ<0)=( )
阅读课文《别了,“不列颠尼亚”》9~11段,回答下列各题。