您要查找的是不是：
- The optimal conditions were obtained.The thermogravimetry showed that PMS was possessed of excellent heat weight loss ratio of PMS was 4% at 700 . 研究了水解温度、溶剂、水与单体的摩尔比、缩聚温度、缩聚时间以及胺的结构对产物性能的影响，获得了最佳的合成条件。
- The occurrence ratio of rock desertification was increscent with aggrandizement of gradient. 石漠化的发生率基本随坡度的增大而增大。
- The weathering of rock are zoned in terms of the ratio of wave speed, integrality index of rock mass and rock quality index. 运用岩体波速比、岩体的完整性系数、岩石质量指标分别对岩体风化进行了分带；
- This layer of rock contains a lot of flint. 这一岩层中有大量燧石。
- The mountain rise up in a steep wall of rock. 这座山高而陡，形成一道岩石屏障。
- The mountain rose up in a steep wall of rock. 这座山高而陡，形成一道岩石屏障。
- The ratio of students to teachers is 35:1. 学生和老师的比率是三十五比一。
- A spur of rock stuck out from the mountain. 山背上突起一个石脊。
- The ratio of schoolboys to schoolgirls is 2 to 1. 男学生和女学生的比例是2比1。
- Men outnumber women here in the ratio of three to one. 此地男子数量以三比一超过女子。
- He managed to hang on to a piece of rock protruding from the cliff. 他设法抓住了悬崖上向外伸出的岩石。
- They drilled through several layers of rock to reach the oil. 他们钻透了几层岩石以寻找石油。
- Pieces of rock plummeted down the mountainside to the ground below. 岩石一块块顺著山的陡坡滚落到地面。
- The ratio of men to women was two to one. 男女的比例是二比一。
- During the earth tremor a large piece of rock chopped out of the ground. 在一阵轻微的地震中，一大块岩石突然从地下露出地面。
- The reason for this strength loss is pretty simple when you think about it. 当你去思考有关绳子强度损失的原因，会发现它是很简单的道理。
- Test system for Posson's ratio of rock cuttings 岩屑泊松比实验测定仪
- A fall of rocks blocked the road. 掉落的岩石把路封住了。
- We finally got at a ledge of rock near the summit. 我们最后到达了靠近峰顶的一块突出的岩崖。
- ratio of dry and wet acoustic wave velocity of rock 干湿声速比
