select 刷新

<select ... >
  <option value="hebei" <%= null != sheng && "hebei".equals(sheng) ? " selected" : "" %>四川 </option>
  <option value="beijing" <%= null != sheng && "beijing".equals(sheng) ? " selected" : "" %>>北京 </option>
  <option value="henan" <%= null != sheng && "henan".equals(sheng) ? " selected" : "" %>>河南 </option>
</select>

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