高频信号发生器使用时，频率调整旋钮改变的是主振荡回路的（）。

搜题请搜索小程序“爱下问搜题”

问题单项选择题

A、可变电容

B、电压高低

C、电流大小

D、可变电阻阻值

答案

参考答案：A

问答题

1.	Is your uncle a doctor? ____________________________________________________
2.	Is your aunt a singer? ____________________________________________________
3.	Is your father a farmer? ____________________________________________________
4.	Is your mother a nurse? ____________________________________________________
5.	Is your brother a baseball player? ____________________________________________________
6.	Are you a student? ____________________________________________________

问答题简答题

磨煤机油箱油温低有何影响？