题目内容

下面关于二极管结构和应用场合的表述正确的是（）

A. 二极管按其制造工艺可分为点接触型、面接触型和平面型三种。
B. 点接触型二极管的结电容小，但允许流过的电流也小，常用于高频小信号的检波。
C. 面接触型允许流过的电流大，但结电容也大，常用于低频大电流的整流。
D. 平面型通常在集成电路中制作，常用作开关。

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