下列()会使预加氢催化剂寿命缩短
A.反应器温度过高;
B.进料干点过高;
C.进料空速过高;
D.循环气氢纯度过低,氢分压下降;
E.氢油比过低等。
参考答案:A, B, D, E
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某同学要对化学实验室中空气质量进行检测,需要对室内气体取样,怎样用简单的方法从室外带仪器进入实验室中取出化学实验室里的气体样品?
所需的用品为: _______ ,操作方法是 ___________________________________________