Question: Plot quality

I have studied most posts about plot quality, still confused.

 

When I export 2d graphs and import the to microsoft word, the quality is horrible. How can I presents my results in a reseanably good way? 

what command should I add to my code that the quality increase notoceably? 

Any suggestion about 3d plots? 

If I export as an eps file, how can I import that in microsoft word? I did, but I guess they are not compatibble. 

 

thank you 

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