Question

a i - beams. b short spans. c continuous trusses. d cables to carry the load. click the button or type the letter next to your answer.

Explanation:

To solve this, we analyze each option in the context of structural engineering (a subfield of Engineering, under Natural Science):

• Option A: I - beams are common in many structures but not specific to a unique structural system.
• Option B: Short spans can be handled by various structural elements (like simple beams), not a defining feature of a specific system.
• Option C: Continuous trusses are part of truss systems, but not the most distinctive for a cable - supported or suspension - like system.
• Option D: Cables to carry the load is a key feature of cable - stayed or suspension bridges (or similar cable - based structural systems), where cables are the primary load - carrying elements.

Answer:

D. cables to carry the load.