iMac Intel 21.5" Retina 4K 显示屏 2019 内存更换

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Lift the RAM module to an angle of about 30 degrees and slide it out.
When handling the RAM module, touch only the outside edges. Take care not to touch the gold-colored contact points along the bottom edge.
To install a new RAM module, slide it in place at about the same angle until it is snug, and then swing it downward until the two clips snap into place.

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