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棉纤维的横截面是圆形的。()
参考答案：错误
安装了防火墙软件的主机可以利用防火墙的坐(9)功能有效地防止外部非法连接来拦截木马程序。
(9)A．身份认证 B．地址转换 C．日志记录 D．包过滤
听力原文：These electronic measuring devices will probe and monitor cities and endangered species, the atmosphere, our ships, high vehicles, our bodies—even our dreams.
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听力原文：The economist John Maynard Keynes argued that market behavior. could not be rational, or subject to improvement, since our existing knowledge did not provide a sufficient basis for a calculated mathematical expectation of investment returns.
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