在现代工业生产中,塑料件的广泛应用使得其耐候性和老化性能的研究越来越重要。尤其是紫外线(UV)辐射对塑料材料的影响,直接关系到产品的使用寿命和安全性。深圳市讯科标准技术服务有限公司推广部致力于为企业提供专业的检测服务,尤其是在ISO 4892-3标准下的塑料件UV老化测试方面具备丰富的经验。
1.Here is a letter ( ★ )from a Heart-to-heart piece in the Teens on November 3.A.adopted; B.accepted; C.adapted; D.heard.答案是选C,可我怎么也想不清楚,我认为D也可以啊!
Imagine yourself at the end of the year or maybe 3 five years. What do you see? 4 do people see you? What are you doing? Are you 5 ? Well, a dream is just that. It’s a vision (远见) of how you 6 yourself in the future. As long as you know the direction in which you ...