放大器的输出电阻是从放大器输入端进去的等效电阻，它是个直流电阻。
参考答案：错
“三年再造一个宅急送”。未来三年的“3个一”建设目标是？
He has two friends. One is English, ________ is Chinese.[ ]
A. others
B. the others
C. other
D. the other
