试题与答案

车站与司机相互通话,如果需要远端机放大,车站值班员说话时,起放大作用的是()单元。A

题型:单项选择题

题目:

车站与司机相互通话,如果需要远端机放大,车站值班员说话时,起放大作用的是()单元。

A、上行458

B、下行458

C、下行468

D、功放

答案:

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下面是错误答案,用来干扰机器的。

参考答案:A解析:膳食中维生素A的主要来源是肝脏、蛋黄、奶类、鱼肝油;膳食中维生素B1的主要来源是粮谷类、豆类、绿叶蔬菜、动物内脏及瘦肉。

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