Given that there are two points a and B on the number axis, the distance between a and B is 1, and the distance between a and the origin is 3, then the number corresponding to point B is ()

2 or 4

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1. I asked whether 0 was odd or even, and the teacher said it was even. I thought: we only study whether multiples and factors 0 are odd or even in the range of natural numbers (except 0)
2. How many days can we transport a batch of goods by car, 1 / 4 of them every day? Transport a batch of goods by car, 2 / 7 of this batch of goods every day, how many days can it be completed?
3. There are 40 tons of cement on the construction site, two fifths of which are used in the first day, and six fifths of which are used in the second day. How many tons of cement are used in each of the two days
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5. A number minus four seventh is twelve thirty-five
6. Chickens and rabbits are in the same cage. There are 15 more chickens than rabbits. Chickens and rabbits have 132 feet. How many chickens and rabbits are there?
7. Make 3 desk drawers, 31 cm long, 2 decimeters wide, 12 cm high, at least how many square centimeters of wood I counted 6276
8. The students of a class learned that the class was awarded at the award meeting as follows: it is known that there are 28 students in the class who have received awards, of which 13 students have only received two awards. Then the student who has received the most awards in the class may receive () project Number of people level Three good students Outstanding student cadres Excellent League member city level 323 school level 18612 Another question: Xiaohua's daily tasks include dressing (4 minutes), making the bed (3 minutes), washing face and combing hair (5 minutes), going to the toilet (5 minutes), cooking (20 minutes) and having breakfast (12 minutes). It takes 49 minutes to complete these tasks. How many minutes do you think the most reasonable arrangement should be?
9. There are 73 red, black and yellow glass balls of the same size, which are arranged in the order of one red ball, two black balls and three yellow balls What's the number? What color should the 58th glass ball be?
10. There are 82 red, blue and yellow glass balls of the same size, arranged in the order of 2 red, 3 blue and 4 yellow?
11. Xiao Ming and Xiao Gang collect stamps together. The ratio of the number of stamps of Xiao Ming and Xiao Gang is 6:5. If Xiao Ming gives Xiao Gang nine stamps, the ratio of the number of stamps of the two is 3:4
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14. As shown in the figure, the graph of the function f (x) defined on [- 1, + ∞) consists of a line segment and a part of a parabola, then the analytic expression of F (x) is______ ．
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16. What is the physical meaning of velocity? What is the symbol?
17. What is the relationship between current to voltage ratio, resistance to power ratio in series parallel circuit?
18. What is power W equal to
19. How many watts is 1p equal to
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