【多选题】Which of the following contents belong to the usages of the disinfectants ?
【多选题】Which of the usages of center lines in views are correct?
A.
Express axis of solids of revolution.
B.
Show the projection of symmetric plane of a solid in a certain direction
C.
Express crossed center lines of circular projections
D.
Express invisible outlines
【单选题】Which of the following usages of the taxes is NOT mentioned in the passage?
A.
For raising their revenues.
B.
For public works and municipal buildings.
C.
For police and fire departments.
D.
For sustaining development.
【单选题】动态数列中,每个指标数值相加有意义的是( )
【单选题】以下关于零次文献的描述错误的是()。
A.
零次文献是指形成一次文献之前的信息、知识、情报
B.
零次文献是未经记录或未公开于社会的最原始的文献