读图回答问题 若�护直升机位于山顶h处被困游客位于a.b.c.d四点中的何点才能被�护人�直接观测到 A.a点 B.b点 C.c点 D Template




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tomski读图回答问题 若�护直升机位于山顶h处被困游客位于a.b.c.d四点中的何点才能被�护人�直接观测到 a.a点 coloring