材料是人类社会进步的重要标志，下列材料属于合成材料的是（）_爱下问搜题

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问题选择题

材料是人类社会进步的重要标志，下列材料属于合成材料的是（　　）

A．陶瓷

B．聚乙烯

C．棉麻

D．铝合金

答案

A、陶瓷属于无机非金属材料，故A错误；

B、塑料是塑料的主要成分，属于合成材料，故B正确；

C、棉麻属于天然材料，故C错误；

D、铝合金属于金属材料，故D错误；

故选：B．

改错题

短文改错。只有一行正确，其余每行均有一处错误。

      Bad weather sometimes causes natural disasters. A snowstorm hitted
Beijing on Saturday, 28th December. The storm got bad in the afternoon.
Tom was on a farm and Uncle Li told him go home late. Li Ming
asked him to go to his house because Tom forgot to take his keys. So
Tom walked to the bus stop on his umbrella with Li Ming. The weather
was really terrible. They could only listen the wind. Snowstorm
continued to fall around them. Sudden they lost their umbrellas in the
wind and Tom nearly fell over. They could do nothing and walk slowly
in the storm. When they arrived in the bus stop, they could see many
people. They was really worried as there would be no bus soon.

1. _________
2. _________
3. _________
4. _________
5. _________
6. _________
7. _________
8. _________
9. _________
10. ________

多项选择题

反不正当竞争法对知识产权的保护包括（）。

A、对未注册商标及其他识别性标志的保护

B、对可以受到单刑法保护但尚未得到授权的客体提供保护

C、对知名形象的保护

D、对知识产权的间接保护