Context: Qin armies finished their conquest of the kingdoms of Shu and Ba by 316 BC. Any written records and civil achievements of earlier kingdoms were destroyed. Qin administrators introduced improved agricultural technology. Li Bing, engineered the Dujiangyan irrigation system to control the Min River, a major tributary of the Yangtze. This innovative hydraulic system was composed of movable weirs which could be adjusted for high or low water flow according to the season, to either provide irrigation or prevent floods. The increased agricultural output and taxes made the area a source of provisions and men for Qin's unification of China.

Question: By what year did the Qin armies finish their conquest of Shu and Ba?
Answer: 316 BC

Question: What did Qin administrators introduce to Shu and Ba?
Answer: improved agricultural technology.

Question: Who engineered the Dujiangyan irrigation system to control the Min River?
Answer: Li Bing

Question: The Min River is a major tributary of what river? 
Answer: Yangtze

Question: The Dujiangyan irrigation system was used for what purpose?
Answer: to either provide irrigation or prevent floods.

Question: Who began their conquest of Shu and Ba in 316 BC?
Answer: Unanswerable

Question: What was preserved during the Qin conquest?
Answer: Unanswerable

Question: Who tried to control the Yangtze river?
Answer: Unanswerable

Question: What was built to control the Yangtze river?
Answer: Unanswerable

Question: The Yantze is a major tributary of what river?
Answer: Unanswerable

Question: By what year did the Quin armies finish their conquest of Yangtze?
Answer: Unanswerable

Question: What did Qin administrators introduce to Yangtze?
Answer: Unanswerable

Question: Who engineered the Dujangyan irrigation sytem to control China?
Answer: Unanswerable

Question: The Qin River is a major tributary of what river?
Answer: Unanswerable

Question: The Min irrigation system was used for what purpose?
Answer: Unanswerable