Bus from passenger transport center to Gu'an

1. Let's talk about my understanding. The relationship between price change and profit and loss of reverse contract is nonlinear. Suppose that the reverse perpetual contract of an exchange is quoted in USD, but all profits and losses are settled by BTC. A customer buys a contract worth $10000 at 8000 USD / BTC
if the price of BTC rises, all positions will be closed at the price of 10000 USD / BTC
profit and loss = (1 / average opening price - 1 / average closing price) * position = (1 / 8000-1 / 10000) * 10000 = 0.25 BTC
(for easy understanding, excluding all expenses)
if the BTC price falls, close all positions at the price of 6000 USD / BTC
profit and loss = (1 / average opening price - 1 / average closing price) * position = (1 / 8000-1 / 6000) * 10000
= - 0.417btc

2. The electric current is I and the length is L. the magnitude of Ampere force in uniform magnetic field B is f = ilbsin (I, b), where (I, b) is the angle between current direction and magnetic field direction. The direction of Ampere force is determined by left-handed rule

3. F = bil, l is the effective length perpendicular to the magnetic field

4. Do you know what bitcoin is? Where do you come from? As long as it is stained with bitcoin, there is nothing good. You dare to buy bitcoin for others. You really live too long.

5. Your next GBA simulator
and then the ROM of the next ranch story
there are catching fish, rare fish selling fish
mining, mining, mining, mining, mining, planting, planting, cherishing seeds selling
and so on

6. When you go to Tangbohu in Qixia town to take the task, you will have four choices: planting trees, fish, pigs and mining. After you choose one, there will be four NPCs beside Tangbohu NPC, spring, summer, autumn and winter. Then you can find the corresponding NPC. After taking the task, there will be four places nearby, including trees, pigsty, fish pond and ore. you can dig things by clicking these things, Then you run to exchange the excavated things with the four incense, and replace them with the later ones. Just go to the seven Xia refiner to synthesize them. When you combine them, you need to separate the stacked ones, and then synthesize them to get the crystals of gold, wood, water, fire and earth. However, one can only learn the same thing. If you want to get four different kinds of crystals, you can either collect them or open four numbers to learn them separately

7.

Hello, everyone. What proceres and precautions do you need to go through to raise fish in large-scale fish ponds in Rural paddy fields? Let me talk about some of these issues

many places are vigorously developing aquaculture, because aquaculture can have higher economic benefits, so a large number of people want to join in this field. However, e to the limited number of natural lakes, ponds and reservoirs, as well as the high contract fee of these natural fish farms, the constant profit of transportation and the inconvenient proction management, many people are keen to build their own fish farms. One of the most common types of fish farms is the occupation of paddy fields. What are the proceres for digging fish ponds in paddy fields? And what should we pay attention to

In a word, one principle is: proper site selection, safety construction, standard proction, honesty and civilization

8. Install killer

9. Your next GBA simulator
and then the ROM of the next ranch story
there are catching fish, rare fish selling fish
mining, mining, mining, mining, mining, planting, planting, cherishing seeds selling
and so on