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单项选择题

提高一个放大器载噪比的办法是尽量提高其（ ）。

A．输出电平
B．传输速率
C．输入电平
D．数据带宽
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做好疫情防控工作，直接关系（），直接关系（），也事关（）。
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Pishu is located under the spinous process of the 11th thoracic vertebra, 1.5 cun beside it. It has the effect of strengthening spleen and harmonizing stomach, promoting digestion food and dispelling dampness. It is often used to treat vomiting, diarrhea, malnutrition,poor appetite, jaundice, edema, slow shock, limb weakness, etc.
单项选择题
In atomic absorption quantitative analysis, one of the basic conditions for replacing the integral absorption with peak absorption is ()
A．The half width of the emission line of the radiation source is much narrower than the half width of the absorption line
B．The half width of the emission line of the radiation source should be almost equal to the half width of the absorption line
C．The half width of the absorption line is much narrower than the half width of the emission line
D．The monochromator must have very high resolution
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