短周期元素甲和乙,甲原子的最外层电子数为a,次外层电子数为b;乙原子的M层电子数

题型:选择题

问题:

短周期元素甲和乙,甲原子的最外层电子数为a,次外层电子数为b;乙原子的M层电子数为(ab – 1),L层电子数为(a + b)。则甲、乙两元素形成的化合物具有的性质是:①与水反应;②与硫酸反应;③与氢氧化钠溶液反应;④与氯气反应。

A.①②

B.②③

C.②④

D.③④

考点:构成物质的粒子—分子、原子、离子元素周期律
题型:选择题

根据《规划环境影响评价技术导则(试行)》,规划的环境影响预测包括预测其直接的、间接的环境影响,特别是规划的()。

A.累积影响

B.一次性影响

C.可逆影响

D.不可逆影响

题型:选择题

2002年4月5日,陕西某县刮大风。刘某因急事骑自行车经过该县自建公路,突然大风将路旁的护路树刮断,断树砸中刘某头部,当即昏迷倒地。后抢救无效死亡。经查倒下的护路树是因严重虫蛀中空而被风刮倒,该公路两侧的护路树虫蛀率达到74%。刘某家属向该县公路管理段要求赔偿损失,公路管理段答称该段已经将采伐更新虫蛀护路树的任务承包给某村,某村长期不开始采伐,造成损失,应由某村负责。关于本案_________。

A.刘某应当向某村要求赔偿损失

B.刘某应当向县公路段要求赔偿损失

C.县公路段应当承担责任后,向某村追偿

D.县公路段无过错,不应当承担责任

题型:选择题

国际货币基金组织、世界银行、关税及贸易总协定三大经济支柱相继问世,为世界经济构建了较为合理的()、互惠互利的机制。

题型:选择题

护士打针前先把针筒里的药挤水出一些。这是为什么()

A、疏通针头

B、给针头消毒

C、排出空气

题型:选择题

I was a single parent of four small children, working at a low paid job. Money was always tight, but we had a (1) over our heads, food on the table, clothes on our backs, and if not a lot, always (2) . Not knowing we were poor, my kids just thought I was (3) . I’ve always been glad about that.

It was Christmas time, and although there wasn’t (4) for a lot of gifts, we planned to celebrate with a family party. But the big (5) for the kids was the fun of Christmas (6) .

They planned weeks ahead of time, asking (7) what they wanted for Christmas. Fortunately, I had saved MYM120 for (8) to share by all five of us.

The big (9) arrived. I gave each kid a twenty-dollar bill and (10) them to look for gifts of about four dollars each. Then everyone scattered. We had two hours to shop; then we would (11) back at the "Santa’s Workshop".

Driving home, everyone was in high Christmas spirits, (12) my younger daughter, Ginger, who was unusually (13) . She had only one small, flat bag with a few candies—fiftycent candies! I was so angry, but I didn’t say anything (14) we got home. I called her into my bedroom and closed the door, (15) to be angry again. This is what she told me.

"I was looking (16) thinking of what to buy, and I (17) to read the little cards on the ’Giving Trees’. One was for a little girl, four years old, and all she (18) for Christmas was a doll. So I took the card off the tree and (19) the doll for her. We have so much and she doesn’t have anything. "

I never felt so (20) as I did that day.

4()

A.effort 

B.room 

C.time 

D.money

更多题库