【单选题】下列离子中,属于(9~17)电子构型的是
【单选题】下列离子中,属于9~17电子构型的是:( )
【单选题】[普化5] 下列离子中属于 9—17 电子构型的是( )。
【单选题】Would you like ______ bread to eat?
【多选题】有两列简谐横波的振幅都是 10cm ,传播速度大小相同。 O 点是实线波的波源,实线波沿 x 轴正方向传播,波的频率为 3Hz ;虚线波沿 x 轴负方向传播。某时刻实线波刚好传到 x =12m 处质点,虚线波刚好传到 x =0 处质点,如图所示,则下列说法正确的是
B.
平衡位置为 x =6m 处的质点此刻振动速度最大
D.
平衡位置为 x =6m 处的质点始终处于振动加强区,振幅为 20cm
E.
从图示时刻起再经过 0.75s ,平衡位置为 x =5m 处的质点的位移
【简答题】A. Do you prefer to shop online or go to the mall?Tell you reasons what you prefer and give your reasons with about 100 words. B. In our digital age, online business are flourishing.Would you like to ...
【简答题】Waiter : Good evening. 11 ? Lucy: Yes,I'd like the vegetable soup to start with. Waiter: 12 ? Lucy : Roast beef and a salad , please. Waiter : 13 ? Lucy:Just a bottle of orange juice. Waiter: _ 14 ? L...