金属铜在一定条件下会因锈蚀而产生“铜绿”.某化学活动小组欲了解铜锈蚀需要的条件,

题型:问答题

问题:

金属铜在一定条件下会因锈蚀而产生“铜绿”.某化学活动小组欲了解铜锈蚀需要的条件,他们将5条铜片分别按下图所示进行实验,放置1个月后,观察到如下现象:

实验装置    甲    乙    丙    丁    戊
实验条件

实验现象无变化无变化无变化无变化产生铜绿
(1)通过实验观察可知,铜锈蚀的条件比铁生锈的条件多出的物质名称是______

(2)已知“铜绿”的化学式是Cu2(OH)2CO3,则生成“铜绿”的化学方程式可表示为______.该反应的基本反应类型属于______反应.

(3)请你说出一种防止金属铜锈蚀的方法:______.

考点:设计实验和科学探究化学反应方程式的书写文字表达式金属的锈蚀与防护
题型:问答题

下列交易或事项引起资产一增一减的是()。

A.以银行存款购买设备

B.以银行存款归还短期借款

C.以银行存款支付办公室水电费

D.赊购原材料

题型:问答题

以下为完全性右束支阻滞的特征性心电图表现,但应除外()。

A.V1或V2导联QRS波群呈rsR′型

B.Ⅰ、V5、V6导联S波增宽

C.V1、V2导联T波倒置

D.V1导联R峰时间>0.05s

E.Ⅰ、V5、V6导联T波方向与QRS波群主波方向相反

题型:问答题

阅读理解。

     "Soon, you're going to have to move out!" cried my neighbor upon seeing the largest tomato plant

known to mankind, or at least known in my neighborhood.

     One tiny 9-inch plant, bought for $1.25 in the spring, has already taken over much of my rose bed,

covering much of other plants, and is well on its way to the front door.

     Roses require a good deal of care, and if it weren't for the pleasure they give, it wouldn't be worth

the work. As it is, I have a garden full of sweet-smelling roses for most of the year. Bushes must be

pruned(剪枝) in early spring, leaving ugly woody branches until the new growth appears a few weeks

later. It was the space available in the garden that led me into planting just one little tomato plant. A big

mistake.

     Soil conditions made just perfect for roses turn out to be even more perfect for tomatoes. The daily

watering coupled with full sun and regular fertilizing have turned the little plant into a tall bush. The cage

I placed around it as the plant grew has long disappeared under the thick leaves.

     Now the task I face in harvesting the fruit is twofold: First, I have to stand on my head, and once

found I have to reach down and under, pick the tomatoes and withdraw (缩回) my full fist without

dropping the prize so dearly won. I found tow full-blown white roses completely hidden as I picked

tomatoes in June. But they were weak and the leaves already turned yellow for lack of light.

     Here I am faced with a painful small decision. To tear up a wonderful and productive tomato plant

that offers up between ten and twenty ripe sweet tomatoes each day or say goodbye to several

expensive and treasured roses. Like Scarlet in Gone with the Wind, I'll think about that tomorrow.

1. The writer decided to plant the tomato just because ____.  

A. it cost little  

B. the soil conditions were proper 

C. the space left could be used 

D. the roses were growing too fast

2. What are the requirements for the healthy growth of rose? 

A. Enough care and right soil conditions. 

B. Frequent pruning and fertilizing. 

C. Tomato plants grown alongside. 

D. Cage placed around the roots.

3. By saying "the prize so dearly won" in Para.5, the writer wants to ____.   

A. show the difficulty in picking the tomatoes 

B. show the hardship of growing the roses 

C. express her liking for the roses. 

D. express her care for the tomatoes

题型:问答题

女,65岁,冠心病心绞痛史8年,无高血压史,夜间突发心前区疼痛8小时入院。入院时血压为150/90mmHg(20/12kPa),经心电图检查,诊断急性前壁心肌梗死。

第2日患者出现胸闷、大汗、面色苍白,体检心率126次/分,律齐,血压80/50mmHg,双肺满布中小水泡音。此时患者的心功能分级为()

A.Killip分级Ⅳ级

B.Killip分级Ⅲ级

C.纽约心脏病协会(NYHA.分级Ⅳ级

D.纽约心脏病协会(NYHA.分级Ⅲ级

E.全心衰竭

题型:问答题

流行性脑脊髓膜炎的病理为

A.纤维素性炎
B.变质性炎
C.肉芽肿性炎
D.化脓性炎

更多题库