摘要： “神舟六号 的成功发射与回收.表明我国的载人航天技术已经有了突破性进展.在飞船的火箭推进器中常装有液态肼和液态双氧水(H2O2).它们混合时的反应方程式为:2H2O2+X=N2+4H2O.则肼(X)的化学式为······························································································································· ( ) A．N2H6 B．N2H4 C．NH2 D．N2H4O2

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