alleryWhich material makes the highest grade blackboards?
APainted plywood
BMatte PVC foamboard
CEnamelled steel
DLaminated card
Answer & Solution
Correct answer: C. Enamelled steel
1. Cheap boards can be painted wood or matte PVC foamboard.
2. The highest grade boards use porcelain-enamelled steel.
3. Plywood and cardboard are not top grade.
_Source: Wikipedia, Blackboard, Design_
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