Q: Does "The city's economy is service-oriented, as nearly 84% of the working population is employed in service sector occupations[citation needed]." provide a valid answer to "What is the main type of employment in Valencia?"?
A: yes

Q: Does "Through-hole manufacture adds to board cost by requiring many holes to be drilled accurately, and limits the available routing area for signal traces on layers immediately below the top layer on multi-layer boards since the holes must pass through all layers to the opposite side." provide a valid answer to "Which type of construction is more expensive?"?
A: yes

Q: Does "This event is the most important and takes place on Saturday night." provide a valid answer to "How long can the nightly concerts run for?"?
A: no

Q: Does "Through their correspondence European scientists first learned about the Chinese science and culture." provide a valid answer to "Who was the Needham Research Institute named after?"?
A:
no