这些频道能让移动通信运营商用一个发射台就可以覆盖多达10倍于使用现有频率的发射台的地区。

They will allow mobile carriers to cover, from a single tower, up to ten times the area possible from a tower using existing frequencies.

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为某一商用车驾驶室白车身建立了以固有频率为约束条件，焊点体积最小化为目标的优化模型。

An optimization model for the body-in-white (BIW) of a commercial vehicle cab is set up with natural frequency as constraint and minimizing the volume of welding spots as the objective.

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