Is this factory()you took scientific experiences with the workers?

where这个是地点状语从句，
要用the one 应加个介词，at或in

where

the one
因为主语是this factory, 句型是 this factory is ....,而不是 this is the factory．．．

THE ONE

Is this factory ( ) you took scientific experiences with the workers?
还原成陈述句后为:this factory is___ you took scientific experiences with the workers.
可以看出主句缺少先行词,所以用the one代指先行词,其后省略了that或which.

如果是the factory，还原后:
this is the factory ___ you took scientific experiences with the workers.
先行词为the factory,在从句中做宾语,引导词that或which或省略不用.

其实还可以根据意思来判断，句子中说的是“这个工厂”……，意思在强调名词；而不是“在这个工厂……”强调地方！