库内转线作业时,应严格执行()作业规定,加强信号、道岔确认,认真执行好()作业要求。
参考答案:问路式调车;先确认信号后动车
乙烯中混有SO2气体,欲除去SO2,得到较纯净的乙烯,最好依次通过下列哪组试剂的洗气瓶( )
A.酸性KMnO4溶液、浓H2SO4
B.溴水、浓H2SO4
C.浓H2SO4、酸性KMnO4溶液
D.NaOH溶液、浓H2SO4
The Prime Minister refused to comment on the rumor that he had planned to _____.
A.discharge
B.dismiss
C.resign
D.resume