When a pdf is taken from illustrator, white lines appears on images. How can be avoided it?

When a pdf is taken from illustrator, white lines appears on images. How can be avoided it?
I use illustrator cs5. It occures mostly on the cover pages of brochures which contains images, texts and some effects such as drop shadow etc.

Thanks for your reply.
When smooth line art is turned off in Acrobat preferences,the lines disappears but the text becomes raserized and goes its smoothness. Not only that, we are not sure that everyone who is viewing the pdf has the same settings in their laptop or desktop.
Is there any other solution to remove these lines? I have added the screenshot of a part of the pdf.
Thanks once again for your support.

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