【单选题】【消耗次数：1】
分子式为 C3H6若为环状烃，则在催化剂催化下，与（ ）mol氢气加成。
①
3
②
2
③
1
④
0
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<img class="kfformula" src="20200629/1593408044375429.png" data-latex="在{N}_{2}+{3H}_{2}-{2NH}_{3}反应中" width="193" height="32"/>，使用催化剂的理由是（ ）。
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