数字音频技术指标有哪些？
参考答案：
数字音频技术指标有采样频率和量化位数。
Read and order. 读一读，给下列句子重新排序。
( ) I want to fly kites with my father. But he is working.
( ) OK. Let's go.
( ) Hi, Li Ming. What do you want to do?
( ) Yes, I like to play it.
( ) Oh, poor Li Ming. Do you like to play ping-pong?
( ) Would you like to play it with me?
在温度为25℃的实验室中能够获得的最佳真空度为1.01325×10-10Pa，则这样的“真空”中每立方米内的分子数为（）
A．5.64×106
B．2.46×l010
C．7.53×103
D．9.38×108
