What'S 發問'S in english????????

你是想問發問的英文是什麼
就是ｑｕｅｓｔｉｏｎ　

1. Ask question
2. Raise queries

举例：有问题的话，请发问.

可以这样讲
a) If you have any question, please raise up.
b) Please raise your question/queries, if you have any.
c) If you are not clear, you can ask us.

u mean what is the " 's " in What's ?

's = is
what's = what is
it's = it is