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[单选题]
下列AAL协议中,不是面向连接的是( )
A
AAL1b.AAL2c.AAI3/4d.AAL5
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试题答案:
C
答案解释:
【解析】由课本P221表9-2可得结果。
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下列不能作为X.25分组头的前三个字节的标识是( )
192.0.21.36属于( )
数据以分组为单位进行传输的层次是( )
当一个节点要发送数据时,首先监听信道;如果信道空闲就立即发送数据;如果信道忙则等待,同时继续监听直至信道空闲;如果发生冲突,则随机等待一段时间后,再重新开始监听信道的是( )
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网络协议中涉及用于协调与差错处理的控制信息的要素是( )
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40.简述制订婴幼儿一日生活日程的依据。
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28.案例材料 1982年,国家教育部、团中央发布通知,在学校里评选“三好学生”以鼓励先进、激励后进。“三好”是指身体好、思想好、学习好,评选学生的比例占学生总数的5%至10%。自此,“三好学生”的评选成了我国学校教育的传统制度。二十几年来我国进行了数次教改,教育目标在不断更新、丰富和发展,教育观、人才观也发生了巨大转变,而“三好学生”的评比却一成不变。“三好”本是激励学生的一个手段,但在实际中却成了衡量学生表现优劣的硬指标;许多学校在实际操作中,“三好”学生标准却变成了“一好”即学习成绩好。同时,由于
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甲(男)与乙(女)经人介绍相识后于1996年登记结婚,婚后生育一个女孩。由于甲经常出差,夫妻感情逐渐淡漠。从1999年5月起,甲与女同学丙通奸,被乙发现后,甲在外租房和丙同居生活,并生育一男孩。甲乙为此经常争吵,夫妻关系恶化,自2001年初两人分居。2004年1月,乙向法院提起离婚诉讼,请求与甲离婚并向甲提起损害赔偿的请求,但甲不同意离婚。 根据上述案情,回答以下问题并说明理由:
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22. No one knows why we sleep, but it’s certain that we need to. People who are prevented from sleeping begin to suffer obvious effect after a few days --- they think less clearly, and they fall asleep during the working hours. Some may have hallucinations (幻觉). There are no rules about sleep. Generally speaking, grown-ups sleep about seven and a half hours each night and probably more than 60 percent get between seven and eight hours. But perhaps eight percent are quite happy with five hours or less, and four percent or so find that they want ten hours or more. If you feel all right, you’re probably getting enough sleep. The important thing is not to worry how much other people get --- their needs may be different. Exercise doesn’t seem to increase the need for sleep, office workers, for example, sleep for about as long as people doing physically active work. Children sleep more than grown-ups --- perhaps fourteen to eighteen hours soon after birth, going down to grown-up levels by early teen-age. Sleep patterns also tend to be different in the elderly, who may sleep less at night than they did when younger. They find sleep getting more broken, and often make it a rule to sleep during the daytime.(10分)22.1 According to the passage, some people are unable to think clearly because ________.(2分)A. they have hallucinationsB. they sleep for too many hoursC. they don’t have enough sleep D. they feel sleepy during the working hours
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