Problem: Szlachta:

Concerning the early Polish tribes, geography contributed to long-standing traditions. The Polish tribes were internalized and organized around a unifying religious cult, governed by the wiec, an assembly of free tribesmen. Later, when safety required power to be consolidated, an elected prince was chosen to govern. The election privilege was usually limited to elites.

What contributed to the long standing traditions?
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A: geography


Problem: Hokkien:

Hokkien dialects are typically written using Chinese characters (漢字, Hàn-jī). However, the written script was and remains adapted to the literary form, which is based on classical Chinese, not the vernacular and spoken form. Furthermore, the character inventory used for Mandarin (standard written Chinese) does not correspond to Hokkien words, and there are a large number of informal characters (替字, thè-jī or thòe-jī; 'substitute characters') which are unique to Hokkien (as is the case with Cantonese). For instance, about 20 to 25% of Taiwanese morphemes lack an appropriate or standard Chinese character.

Approximately what percentage of Chinese morphemes lack a standard chinese character?
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A: 20 to 25%


Problem: Russian Soviet Federative Socialist Republic:

The Soviet regime first came to power on November 7, 1917, immediately after the Russian Provisional Government, which governed the Russian Republic, was overthrown in the October Revolution. The state it governed, which did not have an official name, would be unrecognized by neighboring countries for another five months.

What wasn't the name of the republic the Russian Provisional Goverment ruled?
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A: unanswerable


Problem: Railway electrification system:

DC commutating electric motors, if fitted with laminated pole pieces, become universal motors because they can also operate on AC; reversing the current in both stator and rotor does not reverse the motor. But the now-standard AC distribution frequencies of 50 and 60 Hz caused difficulties with inductive reactance and eddy current losses. Many railways chose low AC frequencies to overcome these problems. They must be converted from utility power by motor-generators or static inverters at the feeding substations or generated at dedicated traction powerstations.

How do railways try to solve the problem of inductive reactance of AC system?
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A:
low AC frequencies