静电本体包括阴极、阳极、槽型极板系统，（）和壳体。
A.电源装置
B.振打装置
C.集尘装置
D.均流装置
参考答案：D
You have just read the newspaper . Did you find in it ?
A. interesting anything B. anything interesting C. interesting something
已知H-H键能为436KJ/mol，H-N键能为391KJ/mol，根据化学方程式：N2＋3H2＝2NH3 ΔH＝-92.4KJ/mol，则N≡N键的键能是[ ]
A．431 KJ/mol
B．946 KJ/mol
C．649 KJ/mol
D．869 KJ/mol
