【单选题】一分钟声音,双声道、8位采样位、原始声音频率为11.025kHz,数据量为()
【单选题】13-4、公式As=Aa/S=SaR( f P-1)/ ρ 0 中, ρ 0 和 f 分别代表的含义是( )。
A.
p 0 为入流污泥浓度, g/m 3 f 为溶解效率
B.
p 0 为出流污泥浓度, g/m 3 f 为溶解系数
C.
p 0 为入流污泥浓度, mg/m 3 f 为溶解效率
D.
p 0 为出流污泥浓度, mg/m 3 f 为溶解系数
【单选题】圆x2-6x+y2+2y=0关于直线方程为y= x对称的圆的方程
【单选题】圆x 2 +y 2 ﹣ax+2y+1=0关于直线x﹣y﹣1=0对称的圆的方程为x 2 +y 2 =1,则实数a的值为 [ ]
【简答题】写出单词的正确形式。 1. We are writing to you about ___________(保护) wild animals. 2. If farmers _________(继续)to make new farmland, wild animals won't get enough food. 3. His job is (喂)animals. 4. You can know t...
【单选题】已知圆x 2 +y 2 =4与圆x 2 +y 2 -6x+6y+14=0关于直线l对称,则直线l的方程是 [ ]
【简答题】单词拼写。 1. Trees along the road provide ____ (遮蔽) from the sun for the farmers. 2. As e____ was cut off, they had to use candles instead. 3. The poor man was badly i____ in the train accident. 4. The __...
【简答题】一分钟声音,双声道、8位采样、采样频率44.1kHz,则该声音文件的大小为 ( )MB(保留两位小数)。