53设直线OA的解析式为yon=kr.把A(5,10)代入,得10=5k.解得k=2.∴yn=2r,∴当 x=3时, y_1=2*3=6 . ∵H(3,0) .G H⊥r轴. ∴G(3,6) . ∵∠GAP=∠AOH .∴ OB =AB.设B(m,0).A (5.10).O(0,0). ∴m^2=(m-3)^2+10 .解得m m-(25)/2 ∴B((25)/2,0) ....
故答案为:1s22s22p63d104s24p1;(2)A.因砷和镓的电子排布中最后填充的是p电子,则都属于p区元素,故A正确; B.GaN、GaP、GaAs晶体结构与单晶硅相似,属于原子晶体,故B错误;C.Ga的金属性强,则第一电离能小,电负性小,故C正确;D.Ga的金属性强,则第一电离能小,电负性小,故D错误;故选AC.(3)反应为(CH3)...
10. G20杭州峰会时“最忆是杭州”文艺晚会采用LED节能光源,用GaP(磷化镓)作为光源材料其中P为-3价,则Ga元素的化合价为 (C) A. -5价 B.+2价
[npm package minimized gzipped size (select exports)](https://img.shields.io/bundlejs/size/iron-session?exports=getIronSession) -<p align="center">Online demo: <a href="https://get-iron-session.vercel.app/">https://get-iron-session.vercel.app</a> 👀</p> +**`iron-session` is...
The archaeological survey in the Homs Gap has allowed us to document an important megalithic phenomenon. Beside the small megalithic necropolises, which are spread all around the survey area, we have found a much-extended megalithic landscape near the Orontes River, in the basaltic plain. The an...