Water is added to a test-tube containing dilute sulphuric ac

t.tolerance is water,dilute the pain of salt. some steel wool is put into the test tube to trap the ice cu half-fill a test tube with water!请问结构是怎么样的half-fill 做什么语? 英语翻译Municipal water is subject to frequent and detailed test TEST TUBE 新梅店怎么样 TEST TUBE 嘉里城店怎么样 （1）A adds to B 和 A is added to B 有什么区别? It Is safe to register the letter containing the check. TEST TUBE 三里屯店怎么样 TEST TUBE 中信泰富店怎么样 TEST TUBE 正大店怎么样 it is nothing but time A.to add B.to be added c.adding D.add