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There are several factors that affect the span of control. Some of these factors include capability of workers, geographical dispersion, the amount of tasks required and so much more.
span bridge
A bridge's span is the length that crosses the gap.
The span is the distance between supports. The sum of the span lengths is the bridge length.
I think you probably mean "bridge span" rather than "spam bridge." A bridge span is the part of the bridge between its supports.
its the span of a bridge for which the cost of building both substructure and superstructure is same....
A span of gap is something in a gas leak or under a bridge that smokes.
the span
Tsurumi Tsubasa Bridge has a center span of 890m making it the largest bridge in the world!
Akashi-Kaikyo Bridge, Japan is the longest single span bridge which is 1,991 meters long.
That is the correct spelling of "span" (a distance, or to bridge).