第10题: [单项选择]下列关于非坚持CSMA的特点说法正确的是() A. 从不让信道空闲的角度出发,结点在发送前坚持连续侦听,一旦侦听到信道空闲,就以概率为100%的原则发送 B. 不以P=1的概率发送,而是在0~1范围内选值;然后以此概率发送侦,以概率1-P推迟一段时间后再开始侦听 C. 在发送前连续侦听信道 D. 在发送前不连续侦听信道 参考答案:D
第31题:[单选题]它标绘在仪表进近程序图上。 A.It is depicted on instrument arrival procedure charts. B.It is depicted on instrument arrival procedure picture. C.It is depicted on instrument approach procedure picture. D.It is depicted on instrument approach procedure charts. 参考答案:D
第35题: [单项选择]We can learn from the first paragraph that in the world the scheme of tolling systems is A. out of the question. B. anything but new. C. for the sake of safety. D. nowhere near success. 参考答案:B 答案解析:题干问;“从第1自然段我们可以得出,世界上这种交通收费的计划……。”根据原文谈到的 "Norway"和"Singapore", 可见很多国家已经采用了这种计划,所以“一点都不新奇”。而选项[A]“毫不