When people sweat a lot or have severe diarrhea, water and inorganic salts are mainly lost in their blood How to supplement these things`

Yes, it mainly needs to supplement water and inorganic salts, that is, electrolytes. Generally, it can be supplemented by infusion (such as normal saline) and taking some supplements

The figure shows the acrobatic "top pole" performance. One person stands on the ground and carries a vertical bamboo pole with mass m on his shoulder. When a person with mass m on the pole accelerates to decline with acceleration a, the pressure of the pole on the "bottom person" is () A. （M+m）g B. （M+m）g-ma C. （M+m）g+ma D. （M-m）g

Analysis of the people on the pole: under gravity mg, friction FF, Mg FF = Ma; Therefore, if f = m (G-A), the rod has friction force against people, and people also have reaction force - friction force against the rod, which is equal in size and in the opposite direction. The analysis of the rod: the force of gravity mg, the downward friction force of people on the rod FF ', and the support of people pushing the rod to the rod

If the image of function f (3-x) and function f (1 + x) is symmetrical about line x = a, then a=—— I somehow figured out that it was 2 (forgot how to do...),

The simpler way is that f (3-x) and f (1 + x) must be equal in x = a (because they are symmetrical about x = a)
Since there is no limit function here, the arguments must be equal
That is, 3-A = 1 + A, the solution is a = 1

(1) Y = f (x) (a ≤ x ≤ b), then the number of elements in {(x, y) | y = f (x) a ≤ x ≤ B} {(x, y) | x = 0} is? (2) M = {a, B, C, D} n = {- 2,0,1} then f is m → n mapping and f (a) = 0, f (b) = - 2, so how many are f? (3) Find the analytical formula of this function 2f（x）+f（1-x）=x ² Find f (x)

1.1 only one point is (0, f (0))
2.6 if there is one corresponding to 1 in C D, there are three choices for the other, so it is 2 * 3 = 6

Let f (x + 1) = - f (x) be constant for X, then the period of function y = f (x) is 2 If the period of function y = f (x) is 3, the period of function y = f (2x) is 6 Which sentence is correct? Give reasons for what is wrong and right

The so-called periodic function does not need to know more about others, just remember
F (x + T) = f (x), then f (x) is a periodic function and the period is t
First, let's analyze the first sentence, because f (x + 1) = - f (x) is r constant for X, first take x + 2 as (x + 1) + 1
That is, x + 2 = (x + 1) + 1
Then there is f (x + 2) = f ((x + 1) + 1) = - f (x + 1)
Then, from F (x + 1) = - f (x), - f (x + 1) = f (x)
The conclusion is that f (x + 2) = f (x) is obviously a periodic function and the period is 2
It's a little difficult to analyze the second sentence, because you need to know that the periodic function is only for X, specifically
Suppose y = f (2x) is a periodic function, that is, f (2x) = f (2x + T), but its period is t / 2, that is to say
F (2x) = f (2x + T) deforms into a specific function for a single X, that is, f (2x) = f (2x + T) = f [2 (x + T / 2)], then the period is t / 2 for X
Then return to the original question, the period of function y = f (x) is 3, then
F (2x + 3) = f (2x), then f (2x + 3) = f [2 (x + 3 / 2)]
So the period is 1.5 instead of 6
The last question has written language, which is cumbersome to explain,
Leave me a message with questions. I hope it can help you solve your confusion

For a higher number, the income function assumes that the income r from production and sales of a product is a quadratic function of output Q. according to statistics, when q = 0,2,4, r = 0,6,8. Determine the functional relationship between income R and output Q

Suppose r = a * q ^ ^ 2 + b * q + C
Q = 0,2,4 and R = 0,6,8 are respectively substituted into the above formula, so as to obtain a ternary linear equation system
Namely: 0 = C
6=4A+2B+C
8=16A+4B+C
The solution shows that a = - 0.5, B = 4, C = 0

When people sweat a lot or have severe diarrhea, water and inorganic salts are mainly lost in their blood How to supplement these things`