On some questions about antiquity, ask for the Emperor of History 5

Science and technology development is also divided into many kinds, ancient China agriculture developed, of course, this is also related to the character of the Chinese people, do not like war, do not like plunder, do not like adventure, depending on the land cultivated for generations as life, in the Han Dynasty, China's farming technology reached the world's first degree, and Europe is different, Europe is divided into many countries, and most of them rely on the sea to survive, Europeans like war, like adventure, like to go to sea to invade everywhere, so also on the structure of the ship in-depth study.

Of course, even if they are studying deeply, the developed shipbuilding technology only surpassed China during the Qing Dynasty, and before the Qing Dynasty, China's shipbuilding technology was still leading the world, especially in the Ming Dynasty, Zheng He's fleet under the Western Ocean was unrivaled at sea.

Many times we think we know, but we are far from the truth!

First assume the facts stated by the landlord, and then refine the details on the basis of this fact.

Detail 1: Long-range shooting, bows and crossbows in ancient times, artillery in modern times, missiles in modern times.

Detail 2: Now many angry young people are complaining that their ancestors are useless, I don't know if they know about the Yellow Sea naval battle that took place between Wu and Qi in the late Spring and Autumn Period of the Eastern Zhou Dynasty, and I don't know if they know that it happened in the Western Han Dynasty, Emperor Wu of the Han Dynasty led 50,000 troops from Qi (now Shandong) to cross the Bohai Sea and march to the Korean Peninsula with Yang Fu, the general of Lou Chuan.

Detail 3: Gunpowder was invented in China and is currently known to be in the middle and late Tang Dynasty.

Detail 4: Ming Chengzu sent Zheng He to the Western Ocean, earlier than Columbus, and the treasure ship was huge, so that later the fleets of European colonizers arrived on the coast of Somalia, and the black compatriots who played with black hats disdained.

Detail 5: Yu Dayou, a famous anti-Japanese general, once put forward a proposal for the modernization of the army on coastal defense.

When the development of science and technology exceeds the budget and exceeds the normal bearing capacity, after all, the consumption of warships needs to be compensated for by supplies, and if there is no worthy return for the results, do you still need to invest in science and technology?

ps: It seems that the building boat is not one side to the end, but the part above the water has a similar arrow stack???

The square head increases the resistance of the water, and the pointed end can reduce the resistance of the water This involves mechanics It's not that there are no discoveries and changes We in ancient China In addition to fighting small island countries, no, even island countries don't fight much, mainly because our country often has internal wars In fact, the so-called 5,000-year-old history is that his own people fight his own people, why does he want a ship.

It may be that the ancient times did not pay attention to the maritime aspect.

In the ancient East, taking China as an example, China's ships basically did not have long-distance sailing, and for the West, the coastline was tortuous, and the port of Duoliang, the ships were basically used for long-distance voyages to sell local specialties, in exchange for what they did not have, and modern ships were not all pointed, I am not a science student, I don't know, the benefits of cutting heads, but you can see that the ancient Greeks traveled, there were many pointed-head ships for long-distance voyages, and the Ming Dynasty of China began to implement the closure of the country, and did not allow the people to trade with foreigners privately, and there was no demand, so that the pointed ships would not be developed, this is my understanding!

Set the clothes to wither the clothes**x the coin is y

7(x+10y)/12=x+2y

x = a piece of clothing is worth a stupid coin.