题目内容

Tourists could choose to take snacks in any restaurants they like.

A. 对
B. 错

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It is up to members of tour group whether they have dinner together.

A. 对
B. 错

The guide is held responsible if tourists are not satisfied with the dishes.

A. 对
B. 错

主要用于生产薄膜和大棚膜的是（）

A. LDPE
B. HDPE
C. PMMA
D. UHMWPE

CPE的全称是

A. 交联聚乙烯
B. 氯化聚乙烯
C. 茂金属聚乙烯
D. 超高相对分子质量聚乙烯