Problem: Please answer a question about the following article about Han dynasty:
The Han dynasty (Chinese: 漢朝; pinyin: Hàn cháo) was the second imperial dynasty of China, preceded by the Qin dynasty (221–207 BC) and succeeded by the Three Kingdoms period (220–280 AD). Spanning over four centuries, the Han period is considered a golden age in Chinese history. To this day, China's majority ethnic group refers to itself as the "Han people" and the Chinese script is referred to as "Han characters". It was founded by the rebel leader Liu Bang, known posthumously as Emperor Gaozu of Han, and briefly interrupted by the Xin dynasty (9–23 AD) of the former regent Wang Mang. This interregnum separates the Han dynasty into two periods: the Western Han or Former Han (206 BC – 9 AD) and the Eastern Han or Later Han (25–220 AD).
When did the Later Han period end?
A: 220 AD
Problem: Please answer a question about the following article about Gamal Abdel Nasser:
Nasser made secret contacts with Israel in 1954–55, but determined that peace with Israel would be impossible, considering it an "expansionist state that viewed the Arabs with disdain". On 28 February 1955, Israeli troops attacked the Egyptian-held Gaza Strip with the stated aim of suppressing Palestinian fedayeen raids. Nasser did not feel that the Egyptian Army was ready for a confrontation and did not retaliate militarily. His failure to respond to Israeli military action demonstrated the ineffectiveness of his armed forces and constituted a blow to his growing popularity. Nasser subsequently ordered the tightening of the blockade on Israeli shipping through the Straits of Tiran and restricted the use of airspace over the Gulf of Aqaba by Israeli aircraft in early September. The Israelis re-militarized the al-Auja Demilitarized Zone on the Egyptian border on 21 September.
What territory did Israel attack in 1955?
A: Gaza Strip
Problem: Please answer a question about the following article about Film speed:
Before the advent of the ASA system, the system of Weston film speed ratings was introduced by Edward Faraday Weston (1878–1971) and his father Dr. Edward Weston (1850–1936), a British-born electrical engineer, industrialist and founder of the US-based Weston Electrical Instrument Corporation, with the Weston model 617, one of the earliest photo-electric exposure meters, in August 1932. The meter and film rating system were invented by William Nelson Goodwin, Jr., who worked for them and later received a Howard N. Potts Medal for his contributions to engineering.
What system was used previous to the ASA system?
A: the system of Weston film speed ratings
Problem: Please answer a question about the following article about Light-emitting diode:
LEDs have also been used as a medium-quality voltage reference in electronic circuits. The forward voltage drop (e.g. about 1.7 V for a normal red LED) can be used instead of a Zener diode in low-voltage regulators. Red LEDs have the flattest I/V curve above the knee. Nitride-based LEDs have a fairly steep I/V curve and are useless for this purpose. Although LED forward voltage is far more current-dependent than a Zener diode, Zener diodes with breakdown voltages below 3 V are not widely available.
What LEDs have a very steep I/V curve?
A:
Nitride-based LEDs