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you might use this to provide a gate code, but now, you can ask drivers to drop off food at the door, or send a photo of where the food should be left. Customers can often also contact their driver directly through the apps to make any delivery arrangements...
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5, the Schlieren optics 52 include a Schlieren stop 80 located between first and second relay lenses, 82 and 84. The Schlieren stop 80 stops the reflected light R and allows the active first diffraction order D1 to pass the Schlieren stop 80. The Schlieren stop 80 is preferably located in...