题目内容

电子实验室有一个外围长度大约2cm的小线圈，当其工作在电源频率为30000MHZ的高频电子实验中时，其波长为。

A. 1cm
B. 1mm
C. 1m

查看答案

搜索结果不匹配？点我反馈

更多问题

当电路的实际尺寸远小于电路的波长时，可用集总参数分析，集总参数也可称为集中参数，就是不考虑元器件的形状和大小。

A. 对
B. 错

The prisoners _____ to escape, but failed.

A. succeeded
B. managed
C. advised
D. attempted

They are determined to ______ pressure to change the law.

A. consist
B. resist
C. assist
D. insist

The boys ____ to be reading when their teacher came in.

A. pretend
B. were pretend
C. pretending
D. pretended