Obviously these are all factors affecting smooth operation, but the underlying p

游客2025-04-13 5

问题 Obviously these are all factors affecting smooth operation, but the underlying problem is still to be identified.

选项 A、operational
B、fundamental
C、operating
D、underneath

答案 B

解析 operational操作的；fundamental基础的，根本的；operating运行的，操作的；underneath下面的。

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