18
A civil engineer will determine the size, spacing, oreintation, strength requirements, and coatings on the reinforcement. These are based upon the calculations of various loads and moments on the structure you are reinforcing and then applying a factor of safety.
2" based strictly on the slab thickness. However, it may be governed by form spacing, rebar spacing or rebar clearance to the forms.
Allowable clearing spacing of bars = 3d where d is depth suppose d is 180 mm than clearing spacing is 3(180) =540mm note that clearing spacing of slab donot exceed upto 750mm
Spacing for floor joists is usually determined by building codes for the location
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30ft
18
4"
A civil engineer will determine the size, spacing, oreintation, strength requirements, and coatings on the reinforcement. These are based upon the calculations of various loads and moments on the structure you are reinforcing and then applying a factor of safety.
Plant spacing provides greater opportunity to plant leaves to receive maximum sun shine for photosynthesis.
You can easily give inline spacing in HTML5. it could be done by placing  
Maximum 30kg chicken /m2. For all sorts of maximum/minimum standards associated with aspects of keeping poultry try this publication: These are the rules developed in Australia and New Zealand by a combined government committee.
The joist spacing required for composite decking will depend on: * the strength of the particular composite decking material chosen * the dimesions of the composite decking material
2" based strictly on the slab thickness. However, it may be governed by form spacing, rebar spacing or rebar clearance to the forms.
structure, spacing, rhythm, arrangement, placing, layout, formation, constitution, distribution, configuration, combination, architecture
There must be an outlet a maximum of every 12 feet. Any wall over 2 ft long except behind a door must have an outlet.