问题
单项选择题
危险化学品标志的使用原则是，当一种危险化学品具有一种以上的危险性时，应用主标志表示主要危险性类别，并用副标志来表示____类别。
A.品名
B.次要危险性
C.加工
答案
参考答案：B
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危险化学品标志的使用原则是，当一种危险化学品具有一种以上的危险性时，应用主标志表示主要危险性类别，并用副标志来表示____类别。
A.品名
B.次要危险性
C.加工
参考答案：B
The umbrella is a very common object. It keeps the and the sun off the people. Most umbrellas can be folded up(折叠) so it is to carry them. However, the umbrella has not always been as as it is now. In the past, it was a symbol of importance. Some African countries still use umbrellas in this .Someone carries an umbrella and walks behind the king or important person. Umbrellas are very old. People in different parts of the world began to umbrellas at different times. The Chinese had them more than 3,000 years ago. From there, umbrellas to India and Egypt. In Greece and Rome, wouldn’t use them. They believed umbrellas were only for women. England was the first country in Europe where common people used umbrellas against rain. The weather there is very and umbrellas are very useful. Everybody uses umbrellas today. The next time you one, thinking that for centuries only great men and women used them, you’ll feel you are important people, too.
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