What is this de 地 or deyu 地与 doing in ...只有选好了工作地点，才能有选择地与招聘单位联系和洽谈...?
http://www.cantonese.sheik.co.uk/dictionary/characters/33/
  
  [粵] dei6 | [國] de5
  
  [suffix] used after an adjective (usually polysyllabic) to form a literary adverbial phrase


Example: 


巧妙 (clever) | 巧妙地 (cleverly)
強烈 (strong) | 強烈地 (strongly)
準確 (accurate) | 準確地 (accurately)


有选择(selective) may not be a common adjective, but 有选择地 is still a literary adverbial phrase. 

有选择地 与 招聘单位 联系


与(with) is preposition 
招聘单位 (hiring department) is the object 
有选择地  is  the adverb modifies the verb 联系


One more example:


無條件投降 "unconditional surrender"  is adjective + noun
無條件地投降 "unconditionally surrender" is adverb and verb


Update:

Seems like that dictionary might left something out.  

有选择 is not an adjective,  it is a descriptive phrase, functions as an adjective only when it is a part of an adverbial phrase 有选择地. 

Example: 

Descriptive phrase:


漫不經心 ( not paying attention)
假仁假義 ( fake kindness)
貪得無厭 ( greed with no limit)


Adverbial phrase:


漫不經心地 ( absentmindedly )
假仁假義地 ( pretentiously )
貪得無厭地 ( greedily)