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在计算机网络ISO/OSI开放系统互联七层参考模型中，最底层是 【9】 。
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微型计算机总线一般有数据总线、地址总线和 【1】 总线组成。
患者，女，60岁，反复咳嗽、咳痰10余年，每年冬季发作3个月以上。查体：桶状胸，双肺叩诊过清音，呼气音延长。 不可能出现的体征是
Sporting activities are essentially modified forms of hunting behavior. Viewed biologically, the modem foot-bailer is in reality a member of a hunting group. His killing weapon has turned into a harmless football and his prey (猎物) into a goalmouth. If his aim is accurate and he scores a goal, he enjoys the hunter’s triumph of killing his prey.To understand how this transformation has taken place we must briefly look back at our forefathers. They spent over a million years evolving as cooperative hunters. Their very survival depended on success in the hunting-field. Under this pressure their whole way of life, even their bodies, became greatly changed. They became chasers, runners, jumpers, aimers, throwers and prey-killers. They cooperated as skillful male-group attackers.Then about ten thousand years ago, after this immensely long period of hunting their food, they became farmers. Their improved intelligence, so vital to their old hunting life, was put to a new use--that of controlling and domesticating their prey. The hunt became suddenly out of date. The food was there on the farms, awaiting their needs. The risks and uncertainties of the hunt were no longer essential for survival. When did hunting for animals become out of date for our forefathers？（）
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