2013年4月20日,四川雅安发生7.0级地震,灾区饮用水安全备受关注。 (1)

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问题:

2013年4月20日,四川雅安发生7.0级地震,灾区饮用水安全备受关注。

(1)明矾是常用的净水剂,它溶于水生成胶状物可以__________悬浮在水中的杂质;生活中既能降低水的硬度,又能杀菌消毒的方法是__________。

(2)“84消毒液”可用于灾区防疫,制备其主要成分次氯酸钠(NaClO)的化学方程式为:2NaOH+X=NaClO+NaCl+H2O,则X的化学式为___________。

(3)2013年3月2日是第21届“世界水日”,我国纪念2013年“世界水日”的宣传主题是“节约保护水资源,大力建设生态文明”,请列举一条生活中节水的做法:___________。

考点:电解水实验水的组成
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女,26岁,体检时发现舒张期杂音,伴第一心音亢进,在第二心音后有开瓣音,此种体征见于()

A.二尖瓣狭窄

B.二尖瓣关闭不全

C.三尖瓣狭窄

D.三尖瓣关闭不全

E.主动脉瓣关闭不全

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Letter A

Dear Rose,

I like your programmes very much. I’m now writing to ask you something about American social customs. My American friends want me to join them in their dinner party. I am very happy and have decided to go, but I’m a little worried about it, too. The social customs in my country are very different from here, so I’m afraid of making mistakes.

Should I bring a present, such as sweets or flowers Should I arrive on time or a little late At the dinner table, how can I know which fork or knife to use How can I let the family know that I’m thankful for their kindness

Wang Lin

Letter B

Dear Wang Lin,

It’s a good idea to bring a small present when you go to a dinner party. Flowers are always nice, or you may bring a bottle of wine if you know that your friends drink it.

You should arrive on time or five to ten minutes late. Don’t get there early. If you’re going to be more than fifteen minutes late, you should call and tell them.

Try to be free at the dinner table. If you don’t know about choosing the right fork or knife, just watch the other people, and follow them. If you still have no idea of what to do, ask the person next to you.

If you like the food, say so. Of course, you’ll thank them for the meal and for their kindness. It’s also a good idea to send a thank you card the day after.

Rose

Which of the following is NOT proper for joining in a dinner party().

A.Get there 15 minutes earlier.

B.Make yourself at home.

C.Follow others to use forks and knives.

D.Thank your friends for the meal.

题型:填空题

客房软床摆放的位置是()。

A、进门见床

B、明显处

C、房间光线最暗处

D、较暗处

题型:填空题

EXC9000静态励磁调节器接收到停机命令或将调节器面板上的“整流/逆变”开关打到“逆变”位置时,在满足()条件下逆变灭磁。

A、发电机已解列;

B、定子电流小于10%;

C、定子电流小于15%;

D、定子电压为零。

题型:填空题

早期的病毒检测工具均使用()。

A.特征代码法

B.校验和法

C.行为检测法

D.软件模拟法

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