偏析度小于零为正偏析。
参考答案:错
Our school had to the soccer games because of the bad weather, which made students frustrated.
A.put on
B.put off
C.put up
D.put down
多媒体系统中,能实现声波/数字信号相互转换,具有播放与录音功能的硬件是()。