【单选题】气态中性原子失去一个电子转化为气态正离子所需要的最低能量叫做第一电离能 ( I 1 ) ,气态正离子继续失去电子所需最低能量依次称为第二电离能 ( I 2 ) 、第三电离能 ( I 3 ) ......下表是第 3 周期部分元素的电离能 [ 单位: eV( 电子伏特 )] 数据。 元素 I 1 /eV I 2 /eV I 3 /eV 甲 5.7 47.4 [来源:Zxxk.Com] 71.8 乙 ...
【单选题】Who won the World Cup 2006 football game? What happened at the United Nations? How did the critics like the new play?【B1】an event takes place, newspapers are on the streets giving the details. Whereve...
【单选题】Who won the World Cup 1998 football game? What happened at the United Nations? How did the critics like the new play?【C1】______ an event takes place, newspapers are on the streets giving the details. ...
【判断题】航空运费计算时,应首先适用特种货物运价,其次等级货物运价,最后是普通货物运价。
【单选题】可通过分泌IL-10抑制巨噬细胞的功能的细胞是