Learn how to avoid certain hosts when using Qsub to throw jobs.

I think it's a simple thing, but I'm in trouble because I can't do it.
I am writing to ask for your advice.

The problem is finding a way to avoid certain Linux hosts when throwing jobs using Qsub.

For example, suppose you have four nodes: Hostname_A, Hostname_B, Hostname_C, and Hostname_D.
When you throw a job to a specific node,

qsub-lh='Hostname_A'xxx.sh

I think is fine with , but I would like to know the reverse (Hostname_A or Hostname_C).

qsub-lh!='Hostname_A'&'Hostname_C'xxx.sh

I'd like to do something like that.

I was using Qsub to throw jobs, but I found that some hosts do not run with memory limitations.
I know the host name, but I am troubled that I cannot do Qsub except for that.

If anyone knows, please let me know.