【单选题】The old gentleman claimed himself to be a very __________ man, who had never told a lie in his life. [ ]
【单选题】Ich gehe ______ der Arbeit nach Hause.
【判断题】Mein Vater war der Leiter eines Lokalen Radiosenders.
【简答题】完形填空。 He lost his arms in an accident that claimed his father's life who was the main 1 of support for the family. He had to 2 the arms of his younger brother, and his younger brother became his 3 , n...
【多选题】下面关于分组交换说法正确的是( )。
A.
分组交换技术中“交换”的概念源于电路交换技术。
B.
分组交换技术与电路交换技术一样,整个过程必须经过“建立连接(占用通信资源)→通话(一直占用通信资源)→释放连接(归还通信资源)”3个步骤。
【简答题】开普勒望远镜对无限远物体成倒立的像,物镜框是系统的孔径光阑,置于一次实像面处的分划板是视场光阑,目镜往往是渐晕光阑。