Descriptor attributes: The Type, DPL, S (system/user), and Present bits from the segment descriptor being loaded, held in a register called PROTUN. In a few cases, the Test PLA takes the 16-bit selector (segment register value) as input instead.
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，这一点在新收录的资料中也有详细论述
Everyone on station was used to the antique ingredients, just as they were used to scooping ice cream out of the core of three-gallon tubs. I often thought of Cherry-Garrard eating porridge and fried seal liver for breakfast and tried to lighten up on the Bush-era butter. The supplies were stored in a vast warehouse behind the station, where the temperature stayed at minus seventy degrees. That’s cold enough to halt the steady bacterial breakdown that occurs in a regular freezer kept at, say, zero degrees Fahrenheit, but not cold enough to suppress my anguish at the prospect of eating a chicken that stopped clucking in 2011.
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