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Hi, experts,

By inserting an equation and number it, the number shows correctly at the end 
of the equation.  But when I want to refer to this equation number in my 
text, how to put the number there (as the \ref{eq:foo} in latex)?  I tried to 
find the answer from help, but only find something talk about "inactive 
label" which can't solve my problem.

Thanks in advance for your help!

Rgds,
Xinhua Ling