搜索
首页
搜索
首页
首页
/
甲、乙是元素周期表中同一主族的两种元素,若甲的原子序数为x,
甲、乙是元素周期表中同一主族的两种元素,若甲的原子序数为x,
甲、乙是元素周期表中同一主族的两种元素,若甲的原子序数为x,则乙的原子序数不可能是( )
A.x+2 B.x+
4
C
.x+8 D.x+18
答案
B
相关题目
影视中心好莱坞所在的城市是 A.圣弗兰西斯科
影视中心好莱坞所在的城市是 A.圣弗兰西斯科 B.西雅图 C.芝加哥 D.洛杉矶
Thank you foryour applause. From you applause I can see your
Thank you foryour applause. From you applause I can see your and support, although the curtain just begins. A. motivation B. compr
--What's that noise? --Bob and his sister ________ computer games. A.have pl
--What's that noise? --Bob and his sister ________ computer games. A.have played B.are playing C.played D.will play
第三次科技革命似惊雷闪电迅速席卷整个世界,其影响之大
第三次科技革命似惊雷闪电迅速席卷整个世界,其影响之大是以往任何一次都无法比拟的。这次科技革命最为突出的核心技术是( )
---I’m not _____ up so early yet but I have to _____ myself to it. ---Yeah.
---I’m not _____ up so early yet but I have to _____ myself to it. ---Yeah. Just as the saying goes,” An early bird catches the worm.” A .used to getting; adopt
下图为我国某盆地自然景观剖面图,读图回答1-3题。 1.根
下图为我国某盆地自然景观剖面图,读图回答1-3题。 1.根据图中信息判断,该盆地为 A.塔里木盆地 B.准噶尔盆地 C.柴达木盆地 D.四川盆地 2
A bank is the place ______ they lend you an umbrella in fair weather and ask
A bank is the place ______ they lend you an umbrella in fair weather and ask for it back when it begins to rain. A. when B. that
x2+3x+2=0(公式法).
x2+3x+2=0(公式法).
最新题目
那一张硬纸片让它快一些从一木梳子上划过,在让它从同一
Whyshould the dragon have a different character in different parts of the world?
右图是模拟氯碱工业生产中检查氯气是否泄漏的装置,下列
Here is something about Christmas. Every year just after Christmas the January
Please put these teaching materials in order and don’t leave them ______ a
已知0<β<<α<π,且cos(α-)=,sin(-β)=,求cos(α+β)
与直线平行的抛物线的切线方程是 A.2xy+3=0
针对“电荒”局面,很多省市的有关部门采取了“错峰用电
当代中国最基本的国情是( )A.社会生产力水平还比
Is there anything _____ I can do for you? A.which
微信作为一种互动性更强、传播速度更快的传播方式,获得
如图3-3-14所示,A为电磁铁,C为胶木秤盘,A和C(包括支架)
如图,已知四边形是等腰梯形,、分别是腰、的中点,、是
下列方法中能鉴别出空气、氧气、二氧化碳三瓶无色气体的
如图所示,竖直放置的两端封闭的玻璃管内注满清水,管内
关于俄罗斯工业的叙述,不正确的是( ) A. 俄罗斯
第二节 完形填空(共15小题;每小题1分,满分15分) 阅
6.已知某闭花受粉植物高茎对矮茎为显性,红花对白花为显性
在同温同压下,A容器中盛有H2,B容器中盛有NH3,若使它们所
已知:95℃时,KW=1.0×10-12.在该温度下,测得0.1mol·L-1Na2A溶