【简答题】在时间上和数值上均作离散变化的物理信号称为( )信号,在时间上和数值上均作连续变化的物理信号称为( )信号
【简答题】在时间上和数值上均作离散变化的物理信号称为( ),在时间上和数值上均作连续变化的物理信号称为( )
【单选题】— Has the homework been finished? — Our teacher asked you .
A.
whether had the work been finished
B.
if the work had been finished
C.
the homework has been finished
D.
the work had been finished
【单选题】Half of the work ______ by now. [ ]
【多选题】引起商品霉变的微生物主要有以下几种()。
【单选题】●The project budget has been finalized.Additional work has been discovered that was not planned for in the budget or project scope.(74) could provide the fund to cover the newly discovered work item. ...