Freight elevators are equipped with doors of which type?

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Multiple Choice

Freight elevators are equipped with doors of which type?

Explanation:
Freight elevator doors are designed to be counterbalanced to offset the door’s weight. This counterweighting makes opening and closing easier, reduces the demand on the drive mechanism, and improves safety and control when loading heavy freight. The other terms describe either how the car is moved (hydraulic), a lack of power (manual), or how the door moves (sliding) rather than how its weight is balanced, so they don’t capture the essential feature of freight doors.

Freight elevator doors are designed to be counterbalanced to offset the door’s weight. This counterweighting makes opening and closing easier, reduces the demand on the drive mechanism, and improves safety and control when loading heavy freight. The other terms describe either how the car is moved (hydraulic), a lack of power (manual), or how the door moves (sliding) rather than how its weight is balanced, so they don’t capture the essential feature of freight doors.

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