下列各国地理特征的描述，正确的是

下列各式中，计算结果为a⁶的是（　　）

如图是一盆栽藤本绿色植物局部与相关设施的连接示意图，其中A、B为该植物体上生长状态良好的两片绿色叶片，A位于普通空气之中，B位于双向通气的无色透明玻璃盒内，F₁、F₂为通气阀门，氢氧化钠溶液能吸收空气中的二氧化碳，请根据下列题设要求，分析回答：

数 $\sqrt{3}$ 的相反数是____．

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