It is up to members of tour group whether they have dinner together.
查看答案
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
EVA的全称是乙烯/乙酸乙烯酯共聚物。
A. 对
B. 错
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