低密度聚乙烯制成的3PE防腐层易产生应力开裂的主要原因可归结为（）。 发布时间：2019-12-08 02:44 │ 来源：www.tikuol.com 题型：填空题 问题： 低密度聚乙烯制成的3PE防腐层易产生应力开裂的主要原因可归结为（）。
题型：填空题 给下列的问句选择合适的答语。( ) 1. Where are you going?( ) 2. Are you going to the silk shop?( ) 3. When are you going?( ) 4. What are you going to do tonight? ( ) 5. What is it? A. Watch TV. B. It's a post card. C. To the supermarket. D. At 8: 00.E. Yes. 查看答案