单项选择题

优质陈茶的叶底应该具有活性，色质硬挺有光泽。
A、正确
B、错误

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多项选择题

According to bilinear transformation method, the correct options in the following statements are ( ) A、As the name implies, bilinear transformation is a linear transformation that will cause a linear relationship between the edge frequency of the digital filter and the edge frequency of the analog prototype filter. B、Bilinear transformation introduces a one-to-one mapping, as its name shows. C、Although bilinear transformation has linear in it, it is actually a nonlinear transformation. D、Bilinear transformation is a kind of multi-valued mapping, but it can guarantee the linear relationship between the edge frequency of the digital filter and the analog prototype filter.

判断题

按装钽电解电容时,要先焊接负极,后焊接正极,以免电容器损坏。( ) A、正确 B、错误

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