Problem: Printed circuit board:

Subtractive methods remove copper from an entirely copper-coated board to leave only the desired copper pattern. In additive methods the pattern is electroplated onto a bare substrate using a complex process. The advantage of the additive method is that less material is needed and less waste is produced. In the full additive process the bare laminate is covered with a photosensitive film which is imaged (exposed to light through a mask and then developed which removes the unexposed film). The exposed areas are sensitized in a chemical bath, usually containing palladium and similar to that used for through hole plating which makes the exposed area capable of bonding metal ions. The laminate is then plated with copper in the sensitized areas. When the mask is stripped, the PCB is finished.

What object is used to expose selected parts of the photosensitive film to light?
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A: mask


Problem: In 1987, as China began opening to Western capital investment, Spielberg shot the first American film in Shanghai since the 1930s, an adaptation of J. G. Ballard's autobiographical novel Empire of the Sun, starring John Malkovich and a young Christian Bale. The film garnered much praise from critics and was nominated for several Oscars, but did not yield substantial box office revenues. Reviewer Andrew Sarris called it the best film of the year and later included it among the best films of the decade. Spielberg was also a co-producer of the 1987 film *batteries not included.
Who starred in 'Empire of the Sun'?
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Answer: John Malkovich and a young Christian Bale


Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
 South Korea: The event was held in Seoul, which hosted the 1988 Summer Olympics, on April 27. Intended torchbearers Choi Seung-kook and Park Won-sun boycotted the event to protest against the Chinese government's crackdown in Tibet. More than 8,000 riot police were deployed to guard the 24-kilometre route, which began at Olympic Park, which was built when Seoul hosted the 1988 Summer Games. On the day of the torch relay in Seoul, Chinese students clashed with protesters, throwing rocks, bottles, and punches. A North Korean defector whose brother defected to China but was captured and executed by the DPRK, attempted to set himself on fire in protest of China's treatment of North Korean refugees. He poured gasoline on himself but police quickly surrounded him and carried him away. Two other demonstrators tried to storm the torch but failed. Fighting broke out near the beginning of the relay between a group of 500 Chinese supporters and approximately 50 protesters who carried a banner that read: "Free North Korean refugees in China." The students threw stones and water bottles as approximately 2,500 police tried to keep the groups separated. Police said they arrested five people, including a Chinese student who was arrested for allegedly throwing rocks. Thousands of Chinese followed the torch on its 4.5 hour journey, some chanting, "Go China, go Olympics!" By the end of the relay, Chinese students became violent, and it was reported in Korean media that they were "lynching" everyone who was disagreeing with them. One police man was also rushed to hospital after being attacked by Chinese students. On Apr 29, the Secretary of Justice, Kim Kyung Han, told the prime minister that he will find "every single Chinese who was involved and bring them to justice." Later in the day, South Korea's Prosecutor's Office, National Police Agency, Ministry of Foreign Affairs and National Intelligence Service made a joint statement saying that they will be deporting every Chinese student that was involved in the incident. China defended the conduct of the students.
Which Olympics did Seoul host?
A: 1988 Summer Olympics


Context and question: One of the first demonstrations of the ability for telecommunications to help sign language users communicate with each other occurred when AT&T's videophone (trademarked as the "Picturephone") was introduced to the public at the 1964 New York World's Fair –two deaf users were able to communicate freely with each other between the fair and another city. Various universities and other organizations, including British Telecom's Martlesham facility, have also conducted extensive research on signing via videotelephony. The use of sign language via videotelephony was hampered for many years due to the difficulty of its use over slow analogue copper phone lines, coupled with the high cost of better quality ISDN (data) phone lines. Those factors largely disappeared with the introduction of more efficient video codecs and the advent of lower cost high-speed ISDN data and IP (Internet) services in the 1990s.
What company introduced the first device to help deaf people communicate through telecommunications?
Answer: AT&T


Question: The army is also changing its base unit from divisions to brigades. Division lineage will be retained, but the divisional headquarters will be able to command any brigade, not just brigades that carry their divisional lineage. The central part of this plan is that each brigade will be modular, i.e., all brigades of the same type will be exactly the same, and thus any brigade can be commanded by any division. As specified before the 2013 end-strength re-definitions, the three major types of ground combat brigades are:
Is there an answer to this question: What is being dismissed?

Answer: unanswerable


QUES: However, the problem of deflection settings — 'aim-off' — required knowing the rate of change in the target's position. Both France and UK introduced tachymetric devices to track targets and produce vertical and horizontal deflection angles. The French Brocq system was electrical, the operator entered the target range and had displays at guns; it was used with their 75 mm. The British Wilson-Dalby gun director used a pair of trackers and mechanical tachymetry; the operator entered the fuse length, and deflection angles were read from the instruments.

Which system had electrical tracking?
What is the answer?
ANS:
French Brocq