Dad touched the scene and thought of many old things in the past

Dad touched the scene and thought of many old things

RELATED INFORMATIONS

1. When it refers to a group of people, should the predicate be singular or plural
2. 24 students go boating, each boat can take up to 5 people, at least how many boats to rent?
3. Let f (x) be an odd function of (- ∞, 0) ∪ (0, + ∞), and it is a decreasing function in the interval (- ∞, 0) (1) Try to compare the size of F (- 2) and - f (3) (2) if Mn < 0 and M + n < 0, prove that f (m) + F (n) > 0
4. I have had dinner If you are invited to dinner, you say I have
5. 1949*1949-1950*1950+1951*1951-1952*1952+.1999*1999 ji suan
6. The influence of English vocabulary on Chinese
7. How many English words are there in grade one and grade two
8. The derivative function is xcosx. What is the original function
9. Will the quality of a piece of ice change when it turns into water? There is a piece of ice. Will its quality change after it turns into water? It's quality attention
10. After reading 100 pages of a book, there are still 15 pages left to read. (1) what percentage of the total number of unread pages? (2) What percentage of the total number of pages read? (3) What percentage of the students have not read? (4) How many more pages have you read than the rest?
11. When drawing circuit diagram with Proteus, how to draw grounding symbol?
12. Some apples and pears from Carrefour fruit supermarket were put in a basket. The aunt of the saleswoman divided the basket into several piles, and later found that no matter how they were divided, You can always find two piles of fruits from these piles. After combining the two piles of fruits, the number of apples and pears is even. How many piles does the aunt of the shop assistant at least divide these fruits into
13. The distance between a and B is 280km. Two cars of a and B travel from two places at the same time. After four hours' meeting, how many kilometers does a car travel per hour on average fast The average speed of car a is 36km per hour, and the average speed of car B is 36km per hour. How many kilometers per hour does car a travel on average. don't want this one.
14. The distance between a and B is 360 kilometers. Car a starts from a and goes to B, driving 72 kilometers per hour. Car a starts for 25 minutes The distance between a and B is 360 kilometers. Car a starts from a and goes to B, 72 kilometers per hour. 25 minutes after car a starts, car B starts from B and goes to a, 48 kilometers per hour. After the two cars meet, they continue to drive in the same direction. How long does it take car a to start from 120 kilometers after meeting? It costs one yuan per time
15. How to understand the arrangement of column net to make the structure stress reasonable Write a thesis
16. A car and a truck drive from a and B at the same time. The speed of the car is 55 kilometers per hour, The speed of the truck is 45 kilometers per hour, and it meets at 20 kilometers from the midpoint. How many kilometers is the distance between a and B? I'm going to report soon!
17. One passenger train is 190 meters long and the other freight train is 290 meters long. What is the speed ratio between passenger train and freight train 5: 3. When driving in the same direction, the time for two vehicles to cross is 1 minute. Ask them about driving in opposite directions, what is the time for two vehicles to cross?
18. There are three story books and four science and technology books in the bookcase. How many books should you take out at least? How many science and technology books should we take out at least to ensure that we can take out two at a time?
19. Make up a formula with five 5S, and the result is 24,
20. Observe the arrangement of the following numbers, and then fill in the appropriate numbers: 3, - 7, 11, - 15, 19, - 23______ ，______ ．