题目内容

以下哪种材料最适合做精密齿轮 ()

A. PP
B. PBT
C. POM
D. PPO

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下列聚合物熔点最高的是()

A. PA66
B. PA1010
C. PET
D. PBT

下面材料适合做碳酸饮料瓶的是

A. PP
B. PET
C. PC
D. PPO

聚酰胺不具备以下哪个性能特点( )

A. 冲击强度高
B. 结晶度大
C. 是适合用于湿态环境的绝缘材料
D. 具有自润滑性

Listen to the news report and get the main idea.

A. The subtropical storm Alberto has caused a big problem for people in the Gulf Coast.
B. 20 million people have been flooded and need help bacause of the subtropical storm Alberto.
C. The subtropical storm Alberto will stop gradually.
D. The subtropical storm Alberto brings a lot of rain to the Gulf Coast.

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