Ouch. Apple CEO Steve Jobs attacked competitors Google and Research in Motion for their entry into the tablet-computer market on Monday, on the heels of disappointing iPad sales. “The current crop of 7-inch tablets are going to be DOA, dead on arrival,” Jobs said on a conference call. Jobs, who hasn’t addressed investors about earnings in two years, said RIM and Google will “learn the painful lesson” that the tablets are too small. But Jobs’ speech was not enough to save Apple on the market: Shares still dropped 6 percent, making it their biggest single-day loss since 2008.