【单选题】第四周期原子的电子构型为(n-1)d ns ,该元素是
【单选题】如下图所示,在100.00~100.03输出口分别接四盏灯L1~L4,按下0.01三秒后,各灯状态可能为( )。
【简答题】已知X、Y、Z、M、W、R是前四周期中的六种元素。X元素原子形成的离子是一个质子,Y原子的价电子构型为2s 2 2p 2 ,Z的单质在常温下是无色气体且Z原子的单电子个数是同周期元素原子中最多的。 (1) 24 R原子最外层的电子排布图是 ,ZO 3 - 的空间构型是 ; (2) Z、M、W原子序数依次增大,三种元素的第一电离能由大到小的顺序是 ;Y、Z、W三种元素的电负性由大到小的顺序是 。(填...
【单选题】属于人际传播中个人与群体之间的传播形式是
【单选题】Listen to the passage. Choose the sentence that best summarizes the main idea of the passage.
A.
Parents should find a good music teacher.
B.
Children should know their musical goal of each daily practice time.
C.
Parents should allow enough relaxing break.
D.
Children should practice as much as possible every day.
【单选题】在Windows中,回收站的作用是存放( )。
【简答题】Dictation. In this section, listen to a passage. Altogether, the passage will be read four times. The first reading will be done at a normal speed. The second and third readings will be paused by sent...
【单选题】属于人际传播中群体与群体之间的传播形式是