硫酸亚铁是一种可用于治疗缺铁性贫血的药剂,硫酸亚铁 药片外表面包有一层特制的糖衣

题型:实验题

问题:

硫酸亚铁是一种可用于治疗缺铁性贫血的药剂,硫酸亚铁 药片外表面包有一层特制的糖衣,以保护硫酸亚铁不被空气中的氧气氧化成硫酸铁(硫酸铁无治疗贫血的药效)。试设计一个方法,验证某硫酸亚铁药片是否已被氧化(写出主要步骤、现象及有关反应式)。

考点:设计实验方案及探究实验
题型:实验题

阅读理解。

                                                 Wetlands! Valuable Resources on the Earth

    There are many wetlands in China and some of them have become the world's important wetlands. The

Chinese Yellow Sea Wetlands are among them. They are in Yancheng, Jiangsu Province. They are home for

many different kinds of animals. The world's largest Milu Deer Nature Reserve is in them. More than 700

Milu deer live freely there. There are not many red-crowned cranes in the world, but every winter you can

see some in the Red-crowned Crane Nature Reserve in the Yellow Sea Wetlands.

    The temperature in the wetlands is usually neither too high nor too low. There us a lot of rain and sunshine,

too. They are really good places for wildlife. Offering (提供) food and home for some special kinds of animals

is not the only reason why we need to protect wetlands. Wetlands are important because they also prevent

flood. But some people want to change the wetlands to make more space for farms and less space for wildlife.

Luckily, more and more people are beginning to realize the importance of wetlands and wildlife. Every year, on

February 2nd, many activities are held to tell people more about wetlands.

1. The Chinese Yellow Sea Wetlands are in the ______ of China. [ ]

A. east

B. south

C. west

D. north

2. Usually the weather in the wetlands is ______. [ ]

A. hot

B. pleasant

C. cold

D. dry

3. The World Wetlands Day is on ______.[ ]

A. April 22

B. June 25

C. February 2

D. March 22

4. We must protect wetlands because ______.[ ]

A. they are home for wildlife

B. they can offer food to animals

C. they can prevent flood

D. all of the above

5. Some people want to change ______ to make more space for farms. [ ]

A. lands

B. world

C. wildlife

D. wetlands

题型:实验题

用一根长6分米的铁丝做一个长为8厘米、宽为5厘米的长方体框架,它的高是______厘米,它的表面积是______平方厘米,体积是______立方厘米.

题型:实验题

SDH光口有LOS告警说明SDH光口()丢失。

题型:实验题

单纯性高血压无其他并发症,血压高于多少时应先进行治疗后再拔牙()

A.21.3~12.7kPa(160~95mmHg)

B.22.7~12.7kPa(170~95mmHg)

C.24~13.3kPa(180~100mmHg)

D.25.3~13.3kPa(190~100mmHg)

E.25.3~14kPa(190~105mmHg)

题型:实验题

电子商务安全要求的四个方面是______。

A.传输的高效性、数据的完整性、交易各方的身份认证和交易的不可抵赖性

B.存储的安全性、传输的高效性、数据的完整性和交易各方的身份认证

C.传输的安全性、数据的完整性、交易各方的身份认证和交易的不可抵赖性

D.存储的安全性、传输的高效性、数据的完整性和交易的不可抵赖性

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