在图选择题 5 所示电路中 ,当输入电压为 1kHz 、 5mV 的正弦波时,输出电压波形出现底部削平失真。回答以下问题。 ( 1 )这种失真是 失真。 ( A .截止, B .饱和, C .交越, D .频率) ( 2 )为了消除失真,应 。 ( A .增大 , B .增大 , C .减小 , D .减小 , E .换用 大的管子)。 图选择题 5
【简答题】Part Five Listen for the main issues 1. How many jobs does the man have? ( 填入阿拉伯数字即可 ) 2. What does the woman do? -- She has a _______________________. 3. Choose the aspects of self-employment that...
【简答题】CONVERSATION 1 1. Listen to a conversation and choose the best answer to each of the following questions. 1 ). What is the probable relationship between the two speakers? A. They are classmates. B. Th...
【简答题】1 What is the probable relationship between the two speakers? A. They are classmates. B. They are colleagues. C. They are brothers. D. They are professor and student. 2 How many aspects of the differe...