Question

question 12 / 25 mobile ladders must be protected from select the best answer: corrosive materials weather heat all of the above none of the above

Explanation:

Mobile ladders can be damaged by corrosive materials which can eat away at the structure, weather - such as rain, snow, or extreme sunlight can cause deterioration, and heat can also affect the integrity of ladders made of certain materials. So they need protection from all these factors.

Answer:

D. All of the above