Context and question: Semi-additive is the most common process: The unpatterned board has a thin layer of copper already on it. A reverse mask is then applied. (Unlike a subtractive process mask, this mask exposes those parts of the substrate that will eventually become the traces.) Additional copper is then plated onto the board in the unmasked areas; copper may be plated to any desired weight. Tin-lead or other surface platings are then applied. The mask is stripped away and a brief etching step removes the now-exposed bare original copper laminate from the board, isolating the individual traces. Some single-sided boards which have plated-through holes are made in this way. General Electric made consumer radio sets in the late 1960s using additive boards.
After the mask comes off of the board, what step takes off the original plating?
Answer: etching
Context and question: The national capital of India, New Delhi is jointly administered by both the Central Government of India and the local Government of Delhi, it is also the capital of the National Capital Territory (NCT) of Delhi.
The local Government of Delhi and the Central Government of India jointly administer what city?
Answer: New Delhi
Context and question: Approximately 96.4% of Ecuador's Indigenous population are Highland Quichuas living in the valleys of the Sierra region. Primarily consisting of the descendents of Incans, they are Kichwa speakers and include the Caranqui, the Otavalos, the Cayambi, the Quitu-Caras, the Panzaleo, the Chimbuelo, the Salasacan, the Tugua, the Puruha, the Canari, and the Saraguro. Linguistic evidence suggests that the Salascan and the Saraguro may have been the descendants of Bolivian ethnic groups transplanted to Ecuador as mitimaes.
Where do the Highland Quichuas live?
Answer:
valleys of the Sierra region