Note: the query optimizer considers using a functional index when the index expression is used in a relational expression or as an argument to one of the operator class functions.
注意：当索引表达式被用于关系表达式，或作为某个操作符类函数的参数时，查询优化器将考虑使用函数索引。
All cranes will be equipped with a functional weight indicator on the main hoist and a boom Angle indicator, both visible by the operator.
所有的起重机都应当有主钩的起重能力指示器和扒杆角度指示器，并且起重机司机要看得见。
The functional design of each unit allows it to be equipped with a control panel using a programmable logic controller with an operator interface for a highly user-friendly operation.
每个单元功能设计成允许装配一个由逻辑程序控制器控制的拥有高度友好用户界面的控制面板。
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