单项选择题

PN结正向导通时，阻抗很大。
A、正确
B、错误

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What is the communicative function of the following sentence?
Now historians have tended to use adults' reflective sources such as autobiographies to tell us about childhood, but I argue that we really need to use and hear the children's voices. So I use hundreds of evacuee letters in my work.

A．Orientation
B．Purpose
C．Methods
D．Termination

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药敏试验中金黄色葡萄球菌标准质控株是 A.
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