题目内容

塑料包装材料的特点是什么?

A.质轻，透明性较好
B.防水，防潮，耐腐蚀
C.适当的机械强度
D.易于成型加工，价格较便宜

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塑料包装材料应注意的问题是什么？

A.游离单体及降解产物的迁移
B.助剂迁移
C.服役条件
D.防止白色污染。

塑料是添加各种助剂，如填料，增塑剂，稳定剂，润滑剂，色料之后，在一定温度和压力下具有延展性，冷却后可以固定其形状的一类材料。

A. 对
B. 错

Section ADirections:This section is to test your ability to give proper answers to questions. There are 5 recorded questions in it. After each question, there is a pause. The questions will be spoken two times. When you hear a question, you should decide on the correct answer from the four choices marked A, B, C and D given in your test paper. Then you should mark the corresponding letter on the Answer Sheet with a single line through the centre.

A. Nice to meet you.
B. How are you?
C. I’m glad to hear that.
D. Hell, Jim. How are things with you?

Section ADirections:This section is to test your ability to give proper answers to questions. There are 5 recorded questions in it. After each question, there is a pause. The questions will be spoken two times. When you hear a question, you should decide on the correct answer from the four choices marked A, B, C and D given in your test paper. Then you should mark the corresponding letter on the Answer Sheet with a single line through the centre.

A. Yes, please give it to me.
B. No, I can take it myself.
C. Sorry, I can’t help you.
D. Sure. Here you are.