Sat mining website

1. Send mining, covering more than 200 countries, you can understand

2. As long as the program provides running parameters, you only need to use the "CD" command in the command line window to switch to the root directory of the program, then open the final directory of the program, and then enter the executable file name of the program and add a "/ You can view its operation parameters.

3. No doubt it's genuine!

4. Li Shengwei is not a liar in Changsha, Hunan Province. He is a representative figure. In a word, he is not a liar.

5. A shoe store owner sells shoes. The purchase price of a pair of shoes is 40 yuan. Now he sells them at a loss of 30 yuan. Someone came to buy shoes and gave them to a fake 100 yuan. The boss didn't have any change. He went to the next door to exchange 100 yuan. Afterwards, the boss returned 100 yuan to the next door boss. How much did the shoe store owner lose
when the boss changes money, he uses 100 yuan given by the customer! Good 100 change is the customer's, the boss did not take a cent now, pay attention!! I didn't get a cent! So the customer gave 30 yuan, and the boss only lost 10 yuan now! The sale is over! Later, he paid 100 to his neighbor, a total of 110

6. 1) When the boss sells a pair of shoes, 90-60 = 30 yuan. The boss loses 30 yuan
2) the customer gave the boss 100 yuan, the boss wanted to get back 40 yuan (the boss was looking for real money), and the boss lost 40 yuan
3) the 100 yuan given by the customer to the boss is fake money, and the boss loses 100 yuan

therefore, the total loss of the boss is 30 + 40 + 100 = 170 yuan

7. If I'm the owner of a shoe store, if I'm a brand new shoe that hasn't been worn yet, I can change it for him within seven days, otherwise I won't change it for him
thank you

8. No, Qianqiu's principle is centripetal force

9. When the swing moves downward, it is e to the effect of gravity. When it moves to the lowest point, it is not affected by the force in the horizontal direction. At this time, the swing can continue to use through the lowest point because of its inertia; Then the swing starts to slow down upward, and it continues to receive the effect of gravity
to put it simply, consider the motion of the swing as horizontal and vertical. When moving in the horizontal direction, the swing has inertia
later learning also involves the relationship between functions and the transformation of mechanical energy.