【多选题】.为防止硬盘上的会计数据丢失或破坏,下列操作对的有
【多选题】为防止硬盘上的会计数据丢失或破坏,下列操作正确的有( )。
【单选题】When designing for usability, what does memorability mean?
A.
The level of distinction that makes the offering memorable.
B.
Degree of joy and delight, making great memories.
C.
Ease with which users can recall how a system works.
D.
All of the above are correct.
【单选题】关于新制剂的毒理学研究,正确的说法是
A.
新制剂应进行急、慢性毒性,有时还要进行致畸、致癌、致突变等试验
【判断题】离心通风机的全风压为静风压和动风压之和。
【单选题】电压源与电流源等效变换的依据是 ( )。
【单选题】When designing for best bias stability the ( ) configuration should be chosen.
B.
collector-feedback bias