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自动频率控制电路达到稳定状态时,仍然存在()

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Jane:Hi,welcome.I’d like to show you around.Tom:Thank you.The products are so interesting.What’s that?Jane:Oh,it’s our new product.Can you make a guess?Tom:I think it may be a camera.Tom is probably ().

A. going to buy a camera
B. visiting Jane’s company
C. learning to make a camera
D. showing Jane around

超外差接收机的关键部件是(),采用超外差技术可以提高接收机的灵敏度和选择性。

Repaired once again,()the TV set may work for()three years.

A. I believe;another
B. /;another
C. I believe;more
D. /;more

计算机病毒的作用机制中,()是通过修改某一中断向量入口地址,使该中断向量指向病毒程序的破坏模块。

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