下列关于磁流体分选错误的是( )。
A．(A) 磁流体动力分选优点是分选介质为导电的电解质溶液，来源广，价格便宜，黏度较低，分选设备简单，处理能力较大，处理粒度为0.5～6mm的固体废物时，可达50t/h，最大可达100～600t/h
B．(B) 磁流体静力分选优点是分选介质为导电的电解质溶液，来源广，价格便宜，黏度较低，分选设备简单，处理能力较大，处理粒度为0.5～6mm的固体废物时，可达50t/h，最大可达100～600t/h
C．(C) 磁流体动力分选优点是介质黏度较小，分离精度较高，缺点是分选设备较复杂，介质价格较高，回收困难，处理能力较小
D．(D) 磁流体分选是一种重力分选和磁力分选联合作用的分选过程，可以分离各种工业废物和从城市垃圾中回收铝、铜、锌、铅等金属
参考答案：B
解析：磁流体静力分选是在非均匀磁场中，以顺磁场液体和铁磁性胶体悬浮液为分选介质进行分选的过程，(B)错。
| 阅读理解。 | |
| New Zealand | |
| What can you see? Mountains, volcanoes, rivers, lakes, waterfalls, forests, beaches. Both islands are mountainous. In fact, only 30% of New Zealand is flat. |
| Who can you meet? Most people live on North Island. Eighty-five percent of New Zealanders are white men, whose great grandfathers came from Europe.Ten percent are Maoris. The Maoris came to New Zealand from the Polynesian islands probably around the tenth century. Europeans started to arrive in New Zealand about 200 years ago as farmers and traders. | The Maoris When the Maoris first arrived in New Zealand, they lived in villages and were excellent fishermen, hunters and farmers. About 50 years ago many Maoris started to live and work in large cities and took jobs in government, industries, medicine and education. They are proud of their culture and are determined to keep many of the customs which are part of their way of life. |
| 1. Which of the following is a fact about New Zealand? | |
| A. Maoris make up 20% of the population. B. There are four million white people. C. It’s about 1600 km south of the Equator. D. Nearly 1/3 of the country is plains. | |
| 2. When did the white people begin to live in New Zealand? | |
| A. 1000 years ago. B. 200 years ago. C. 85 years ago. D. 50 years ago. | |
| 3. What do the Maoris value most in life? | |
| A. Living in small villages. B. Developing farming skills. C. Keeping their own culture. D. Taking up government jobs. | |