试题与答案

TW42UZ-B1车站电台的回铃音信号中心频率是()。A、114.8Hz B、123

题型:单项选择题

题目:

TW42UZ-B1车站电台的回铃音信号中心频率是()。

A、114.8Hz

B、123Hz

C、131.8Hz

D、415Hz

答案:

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答案:D题目分析:生态系统是指在一定的地域内,生物与环境构成的统一的整体,生态系统包括生物成分和非生物成分,生物成分包括生产者、消费者和分解者,生产者主要指绿色植物,能够通过光合作用制造有机物,为自...

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