Some objects in my scene are missing in render mysteriously. They appeared alright in previous renders but disappears today for unknown reason. Even I redraw them it still doesn't show. I have no idea what I did wrong. See below SU scene, notice the square concrete slabs marked in red:

and this is the render:

the model file is posted here for you to take a look:
https://drive.google.com/open?id=1I0...m&usp=drive_fs
Please help!
and this is the render:
the model file is posted here for you to take a look:
https://drive.google.com/open?id=1I0...m&usp=drive_fs
Please help!
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