第2题: [单项选择]关于无线微波扩频技术,以下哪种说法是错误的______。 A. 相连两点距离可以很远,适用于相连两点之间具有大量阻挡物的环境 B. 抗噪声和抗干扰能力强,适用于电子对抗 C. 保密性强,有利于防止窃听 D. 建设简便、组网灵活、易于管理 参考答案:A 答案解析:[解析] 使用无线微波扩频技术时,相连两点距离不能太远,并且相连两点之间不能有阻挡物。
第21题: [单项选择]A. They don’t like to make friends with others. B. They show less and less trust in others. C. They have been rejected by the societyl D. They never realize the problem of loneliness. 参考答案:B 答案解析:[解析] Q: Why will it be more difficult for lonely people to make friends