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GNSS的中文含义是（）

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GNSS卫星信号从2万公里高空向地面传输，空中经过电离层、对流层，会产生时延。所以GNSS接受机测量的距离含有误差。（）

A. 对
B. 错

Skim Reading 2 for the questions below.1) What is the relationship between global warming and greenhouse gases?

What role does seawater play in global warming?

What is the significance of developing new sources of energy?