如图所示的是血细胞示意图，请据图回答下列问题
A～G是几种烃的分子球棍模型（如图），据此回答下列问题：
（1）常温下含氢量最高的气态烃是 ____ （填字母）．
（2）能够发生加成的烃有 ____ 种，一卤代物种类最多的是 ____ （填写字母）．
（3）写出F发生硝化反应的化学方程式 ____
阅读下列材料，回答问题。
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