题目内容

关于集成运算放大器,下列说法正确的是( )。

A. 集成运放是一种高电放大倍数的直接耦合放大器
B. 集成运放只能放大直流信号
C. 希望集成运放的输入电阻大,输出电阻小
D. 集成运放的KCMR大
E. 集成运放只能用于模拟信号的运算

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集成运算放大电路是一种采用 耦合方式的放大电路,因此低频性能 ,最常见的问题是 。

一个理想对称的差动放大电路,只能放大差模输入信号,不能放大共模输入信号。( )

A. 对
B. 错

Which one is the direct examination of bacterial shape in the clinical specimens of patients?

A. cultivation in medium;
B. Staining for microscopic examination,
C. Biochemical test,
D. detection of antibody;

Which method is not right about collection of clinical specimen for diagnosis of bacterial infection?

A. Specimens stained for microbiologic examination.
B. Avoid specimen contamination during collection.
C. The specimen must be taken to the lab for examination promptly.
D. Specimens should be collected after the administration of antibiotics

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