放大器能转变为振荡器的原因，是放大器中有谐振回路存在。
查看答案
电容三点式振荡器适用于工作频率高的电路，但输出谐波成分比电感三点式振荡器的大。
A. 对
B. 错
振荡器具有稳定输出的原因，是振荡系统中有非线性器件存在。
A. 对
B. 错
Why does the writer believe thinking for oneself is not popular?
A. Because it takes too much time.
Becuase it doesn't lead to progress.
C. Because it is regarded as dangerous.
D. Because only a few people are able to do it.
In the opinion of the writer, how often are people interested in your ideas?
Always.
B. Often.
C. Never.
D. Hardly ever.
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