皮皮学，免费搜题
登录
搜题
【简答题】
b on n. 气球
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【简答题】天然橡胶 橡胶是重要的热带经济林木，性喜高温多雨的气候，惧强风；要求肥沃的土壤和排水良好的地形。橡胶树幼苗栽培后，大约5~6年开始产胶。割胶时，首先用刀在树干上斜着往下割去一层薄薄的树皮，不久便有一道乳白色的液体沿着刀痕流出，这就是胶汁。胶汁流进工人们挂在大树干上的容器里，运到工厂过滤，把胶汁加上水和胶腊，使胶汁凝结。去水后成为乳白色的胶片，再把胶片烘干就成为可制造各种橡胶制品的原材料。橡胶树原产...
【简答题】Tom arrived at the bus station quite early for Paris bus. The bus for Paris would not leave until five to twelve. He saw a lot of people waiting in the station. Some were standing in line(排队), others ...
【简答题】Tom arrived at the bus station quite early for Paris bus. The bus for Paris would not leave until five to twelve. He saw a lot of people waiting in the station. Some were standing in line(排队) , others...
相关题目：
参考解析：
知识点：
题目纠错 0
发布
