单选题甲乙两个旅行社到某航空公司为旅客订飞机票，此问题中的临界资源是（）。A飞机票B旅行社C航空公司D旅行社和航空公司
单选题
甲乙两个旅行社到某航空公司为旅客订飞机票，此问题中的临界资源是（）。
A
飞机票
B
旅行社
C
航空公司
D
旅行社和航空公司
参考解析
解析：
暂无解析
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