问题 问答题 简答题

举例说明离子混合着色的应用?

答案

参考答案:

①使用氧化铈和氧化钛混合着色,可以令人获得满意的金黄色玻璃,适于制造低热膨胀系数的耐热黄玻璃,其熔制简便,澄清良好,且不必进行显色处理,这些都是镉黄玻璃难以达到的。

②将钴和镍两种着色剂适当配比,可以获得由蓝色至蓝色的一系列色调,适于与制造艺术装饰品。

③铁和钴的混合着色可以获得灰色(略带淡黄色调),又称中性灰玻璃。随着铁、钴的比例不同,可以获得一系列深度不同的灰色玻璃。

阅读理解

Sometimes life makes more sense when you look at it in reverse (相反). That's certainly been true for me.

Last Christmas, at 39, I caught a disease which attacked my knees and eyes. At its worst I could hardly walk or see. For months I' d have to crawl (爬) across the floor to use the bathroom or get a drink of water when my husband wasn't home. For a while I could only see shapes and colors so I couldn't drive.

My parents kept begging me to let them come out to stay with me in Los Angeles, but our apartment is small and I knew there was nothing they could really do to help me. For the excellent health insurance my husband had through his job, I was receiving the best medical care possible.

My only problem was that I couldn't drive to my doctors' appointments and I didn't want my husband to keep missing work to drive me. Three days after I explained this to my parents, a check came from them with a note saying this was "taxi money". Several months later another check showed up from my brother to help make up our income since I wasn't able to work. It probably goes without saying that I was extremely grateful to have family members who could and would support me during the hard time.

In terms of my day-to-day existence, I live in a village within Los Angeles called Brentwood so I was able to walk to the local post office, market, bank, and library. But once there, I had to depend on the kindness of strangers to help me. Los Angeles is a big city, but I lived in a village with a wonderful community (社区) of people who were kind and patient.

Slowly I became well. Life was good again and I thought I had a clear understanding of the blessings (恩惠) this illness has provided.

小题1:When the author's husband was at home, he __________.

A.was still busy working

B.often had a good rest

C.often helped her a lot

D.taught her to drive a car小题2:Why did the author not want her husband to drive her to her doctors' appointments?

A.Her husband didn't drive well.

B.Her husband was too busy.

C.She didn't want to affect his work.

D.Her doctor was far away from her.小题3:What is the fourth paragraph mainly about?

A.The help that the author received from her family members.

B.The influence of the author's disease on her family.

C.The author's thanks to her family members.

D.The way the author saw her doctors.小题4:What did the author feel about Brentwood?

A.She thought it was small but convenient.

B.She felt it was hard to live there.

C.She thought it was small and strange.

D.She felt warm and comfortable there.

单项选择题