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under the conditions that 
, 
, 
, 
, and 
. The research shows that if 
is a positive radial weak solution of this equation, then there exist...
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such that 
, where 
is the smallest root of the equation 
. This result accurately depicts the asymptotic characteristics of positive weak solutions of the equation near zero. Compared with previous relevant studies which only indicate that the solutions are bounded near zero, this study further clarifies the limiting situation of the solutions.