validate these changes

[hemmin]

This chapter describes the meaning of emergency maintenance. It also describes the general procedure, and the specific procedures for emergency maintenance

[Tdol]

Is there only one general procedure?

[hemmin]

yes, there is only one general procedure

[Tdol]

It's OK. How about 'defines' instead of 'describes the meaning' in the first sentence?

[hemmin]

i am confused
can we say defines the meaning?

[RonBee]

i am confused
can we say defines the meaning?

Yes. You could also explain the procedure.

(Note: capitalization.)

~R

[hemmin]

oh! thanks
i have another query:
Is this correct?
Change the "512" to a number larger than the value of SM_SIZE by at least 250.
for example, the current number is 100 and the value of SM_SIZE is 50. the current number must be changed to 300 or larger.

any suggestions

[MikeNewYork]

This chapter describes the meaning of emergency maintenance. It also describes the general procedure, and the specific procedures for emergency maintenance

There should not be a comma after "procedure". It is just separating elements of a compound direct object.

[RonBee]

oh! thanks
i have another query:
Is this correct?
Change the "512" to a number larger than the value of SM_SIZE by at least 250.
for example, the current number is 100 and the value of SM_SIZE is 50. the current number must be changed to 300 or larger.

any suggestions

Gramatically it is correct. However, I have no idea what you are talking about.

Say:

I have another query.
For example....
The current number must be changed....