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当8255 PA口工作于方式2，PB口工作于方式0时，其PC口可用作( )
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The biggest problem with the U. S. health - care system is that it has long been designed to respond to illness rather than prevent it. According to an analysis by the Common wealth Fund, a foundation that funds health - care research, half of American adults in 2005 did not receive recommended preventive care, which includes vaccinations, cancer screenings and blood -pressure checks. When we do get our cardiac health checked, too often it’s because we’ve been rushed to the emergency room suffering from chest pains. When we do get a cancer evaluation, too often it’s a diagnosis of advanced disease that has spread beyond the initial tumor site. What will probably happen under the present US health -care system
It’s become the conventional wisdom that the tortured will say anything to make the torture stop, and that "anything" need not be truthful as long as it is what the torturers want to hear. But years worth of studies in neuroscience, as well as new research, suggest that there are, in addition, fundamental aspects of neurochemistry that increase the chance that information obtained undertorture will not be truthful. In common sense, a tortured person will say anything to
与数据的程序控制传送方式相比较，DMA传送方式的主要特点是什么
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