A) Using ball bearings in the door hinge
B) Using a lubricant on the door hinge
C) Using a lever to open the door
D) Using a gear to open the door
Correct Answer: B
Solution :
A lubricant reduces friction. Hence, using a lubricant on the door will ensure that it will open more easily and not make a squeaking sound. The correct answer is B.You need to login to perform this action.
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