题目内容

正弦波振荡器是由三部分组成的,分别为()、()、()

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为了使反馈式振荡电路产生的信号幅度稳定,还应当加上稳幅环节。( )

A. 对
B. 错

In the video, the 3D pinter can produce a range of stuff, they are______

A. concrete buildings、pizza
B. skulls 、babies ( model)
C. kid art、 3D pets and cars
D. all the above

The 3D printing technology has developed to the perfect, there is no room for further advancement.

A. 对
B. 错

对携带___寄存数量较大的危险品,公安机关登记___、___。

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