Problem: Please answer a question about the following article about Railway electrification system:
In the United States, 25 Hz, a once-common industrial power frequency is used on Amtrak's 25 Hz traction power system at 12 kV on the Northeast Corridor between Washington, D.C. and New York City and on the Keystone Corridor between Harrisburg, Pennsylvania and Philadelphia. SEPTA's 25 Hz traction power system uses the same 12 kV voltage on the catenary in Northeast Philadelphia. This allows for the trains to operate on both the Amtrak and SEPTA power systems. Apart from having an identical catenary voltage, the power distribution systems of Amtrak and SEPTA are very different. The Amtrak power distribution system has a 138 kV transmission network that provides power to substations which then transform the voltage to 12 kV to feed the catenary system. The SEPTA power distribution system uses a 2:1 ratio autotransformer system, with the catenary fed at 12 kV and a return feeder wire fed at 24 kV. The New York, New Haven and Hartford Railroad used an 11 kV system between New York City and New Haven, Connecticut which was converted to 12.5 kV 60 Hz in 1987.
What voltage does SEPTA system use?
A: 12 kV voltage
Problem: Please answer a question about the following article about Dog:
In Greek mythology, Cerberus is a three-headed watchdog who guards the gates of Hades. In Norse mythology, a bloody, four-eyed dog called Garmr guards Helheim. In Persian mythology, two four-eyed dogs guard the Chinvat Bridge. In Philippine mythology, Kimat who is the pet of Tadaklan, god of thunder, is responsible for lightning. In Welsh mythology, Annwn is guarded by Cwn Annwn.
What is the name of the dog with three heads in Greek mythology?
A: Cerberus
Problem: Please answer a question about the following article about Protestantism:
In the course of this religious upheaval, the German Peasants' War of 152425 swept through the Bavarian, Thuringian and Swabian principalities. After the Eighty Years' War in the Low Countries and the French Wars of Religion, the confessional division of the states of the Holy Roman Empire eventually erupted in the Thirty Years' War between 1618 and 1648. It devastated much of Germany, killing between 25% and 40% of its population. The main tenets of the Peace of Westphalia, which ended the Thirty Years' War, were:
How much was the German population reduced during the Thirty Years' War?
A: between 25% and 40%
Problem: Please answer a question about the following article about Middle Ages:
In modern-day Germany, the Holy Roman Empire continued to rule, but the elective nature of the imperial crown meant there was no enduring dynasty around which a strong state could form. Further east, the kingdoms of Poland, Hungary, and Bohemia grew powerful. In Iberia, the Christian kingdoms continued to gain land from the Muslim kingdoms of the peninsula; Portugal concentrated on expanding overseas during the 15th century, while the other kingdoms were riven by difficulties over royal succession and other concerns. After losing the Hundred Years' War, England went on to suffer a long civil war known as the Wars of the Roses, which lasted into the 1490s and only ended when Henry Tudor (r. 14851509 as Henry VII) became king and consolidated power with his victory over Richard III (r. 148385) at Bosworth in 1485. In Scandinavia, Margaret I of Denmark (r. in Denmark 13871412) consolidated Norway, Denmark, and Sweden in the Union of Kalmar, which continued until 1523. The major power around the Baltic Sea was the Hanseatic League, a commercial confederation of city states that traded from Western Europe to Russia. Scotland emerged from English domination under Robert the Bruce (r. 130629), who secured papal recognition of his kingship in 1328.
Along with Denmark and Sweden, what country was part of the Union of Kalmar?
A:
Norway