题目

下列过程中，共价键被破坏的是                          A．碘升华                   B．溴蒸气被木炭吸附C．加热NaCl使之融化           D．碘化氢气体受热分解 答案：D We experimented ____ putting oil and water together, and we saw that they didn’t mix. A. with              B. by  C. for               D. at