The alternating SF6 andC4F8 steps are typically repeated several hundred times to achieve the desired trench depth. Point of exhaust scrubbing is required for MEMS Etch, since the waste fluoride byproducts are both highly toxic and corrosive.
In an online campaign dubbed OperationScallop, shared hundreds of times on Facebook and Twitter, activists have urged voters to wait until the final hour of polling so they can track their ballot papers from polling stations to count centres, in an attempt to prevent them being tampered with.
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