室温下,把1 mL 0.1 mol·L-1的H2SO4加水稀释成2 L溶液,在此

题型:选择题

问题:

室温下,把1 mL 0.1 mol·L1的H2SO4加水稀释成2 L溶液,在此溶液中由水电离产生的H,其浓度接近于

A.1×104 mol·L1

B.1×108 mol·L1

C.1×1011 mol·L1

D.1×1010 mol·L1

考点:燃烧热水的离子积常数水电离的影响因素水的电离平衡
题型:选择题

阅读理解。

    Last Sunday I saw the worst storm (暴风雨) in years. It came suddenly and went on for about three

hours. After lunch, I went into my room to have a rest. The air was hot, and all was quiet.

   The strong wind started blowing into my room. Pieces of paper on my desk flew high into the air and

some flew out of the open window. As I ran out to catch them, big drops of rain began to fall.

    When I came back into the house, it was raining harder and harder. I tried very hard to close the window.

Then I heard a loud crashing (碰撞的) sound from the back of the house. I ran out of my room to find out

what it was-a big tree had fallen down and broke the top of the back room.

1. The storm happened ______. [ ]

A .in the morning

B. in the afternoon

C. while I was in the back room

D. while I was in the garden

2. Before the storm came, the weather was ______. [ ]

A. cold

B. cool

C. hot

D. warm

3. The storm went on for ______. [ ]

A. four hours

B. about three hours

C. less than three hours

D. two hours

4. The wind blew some of the paper ______. [ ]

A. all over the floor

B. out of the door

C. into the back room

D. out of the open window

5. The top of the back room was broken because of ______. [ ]

A. the hot air

B. the crashing sound

C. the rain

D. the fallen tree

题型:选择题

黄山是我国闻名的旅游胜地。分析下列图表,回答下列问题(10分)

2008年外省市游客构成情况调查表

客源地游客比例(%) 客源地游客比例(%)
广东14.03 北京6.72
浙江13.81 江西5.22
上海10.82 湖南4.10
江苏8.96 福建2.99
湖北8.21 其他20.14
(1)黄山从旅游资源的类型看主要属于           旅游资源。黄山景区无处不景,无景不奇,以奇松、怪石、       、温泉“四绝”著称于世,被联合国教科文组织列入世界文化遗和自然遗产名录。(2分)

(2)归纳黄山市旅游国内客源地的主要特点。(2分)

(3)简述黄山旅游资源开发的有利区位条件。(3分)

(4)黄山把屯溪区作为接待黄山游客的主要住宿地,其主要原因是什么?(3分)

题型:选择题

白女士,新婚,月经规律,1年内不准备生育,前来咨询避孕方法,你认为最好的方法是()。

A.口服长效避孕药

B.放置宫内节育器

C.避孕套

D.口服短效避孕药

E.肌内注射长效避孕针

题型:选择题

高压锅要经常检查排气孔是否畅通,一般几个月更换一次易熔片?

题型:选择题

施工单位所选用的计量器具和设备,必须具有产品合格证或( )。

A.制造许可证

B.产品说明书

C.技术鉴定书

D.使用规范

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