Non zero natural numbers are either odd or even, right

Yes, of course

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1. A non-zero natural number is either odd or even
2. In non-zero natural numbers, except odd numbers, they are even numbers
3. Three consecutive even numbers, the largest is m, then the smallest should be (). Their average is (). What is the unit of measurement?
4. The distance between a and B is 440 km. A bus and a truck leave from a and B at the same time. They meet in 4 hours. The bus runs 56 km per hour How many kilometers does the truck travel per hour? Lie equation
5. The speed ratio of a and B is known to be 3:4. A starts 15 minutes earlier than B. when a meets B, a walks 6 kilometers less than B. It takes 2.25 hours for B to start from B to meet A. how about the speed of a and B and the distance between a and B?
6. There are three cars, a, B and C, each driving at a certain speed from a to B. B starts 10 minutes later than C and catches up with C 40 minutes later; a starts 20 minutes later than B and catches up with C 1 hour and 40 minutes later?
7. ① When the two vehicles meet on the way, the distance of vehicle a is 60% of that of vehicle B. after the two vehicles meet, the speed of the two vehicles is the same When car B arrives at a, car a is 64 kilometers away from B, and how many kilometers does car a travel? ② car a and car B start from ab at the same time, and run in opposite directions. When the two cars meet on the way, car a drives 40% of ab. after meeting, the two cars continue to drive at the same speed. When car B arrives at a, car a has driven 90 kilometers, and how many kilometers is the distance between AB and car B
8. The distance between a and B is 480 kilometers. A and B start from the two places at the same time and run in opposite directions. They meet three hours later. The speed ratio of a and B is 9:7. How many kilometers does a and B travel in each hour?
9. A car at 45 kilometers per hour from a to B, 3 hours a journey of 57, how many kilometers does the car have to travel to reach B?
10. The speed ratio of a and B is 4:5 when the two cars meet on the way. A car runs 30 kilometers less than B car What is the distance between the two places?
11. Is it right or wrong that there is no largest odd or even number in natural number
12. In natural numbers, it's either odd or even______ (judge right or wrong)
13. In natural numbers, it's either odd or even______ (judge right or wrong)
14. A natural number is either odd or even
15. In addition to odd numbers, there are also 0 and even numbers in natural numbers. Right or wrong
16. A natural number is either odd or even, right?
17. In addition to even numbers, natural numbers are odd numbers?
18. There are 20 natural numbers, of which the odd number is more than the even number, and the sum of them is 100. How many even numbers are there at least?
19. When a = (a is not equal to 0), the preceding natural number is (), and the following natural number is ()
20. If a is a natural number (a is not equal to 0), then the reciprocal of a is ()