The language purposes of this conversation are to
A:introduce oneself and ask for telephone numbers
B:Greet people and give telephone numbers
C:Introduce oneself and greet people.
“珍爱生命、关注健康”对每个人都非常重要,下列做法或认识正确的是( )
已知α∈(0,π2),β∈(0,π2),且cosα=17,cos(α+β)=﹣1114,则sinβ=____
写出反义词
曾经—____ 仁慈—____ 虚弱 —____
遭遇—____ 恶化—____ 痛切 —____
In April, 2009, President Hu inspected the warships in Qingdao, ______ the 60th anniversary of the founding of the PLA Navy.
过抛物线C:y2=4x的焦点F,且斜率为 3 的直线交C于点M(M在x轴上方),l为C的准线,点N在l上,且MN⊥l,则M到直线NF的距离为( )