通信机房门禁安全管理中，外来通信技术人员进出通信机房，必须由（）陪同下方可进入。 A 发布时间：2018-08-24 12:25 │ 来源：www.tikuol.com 题型：单项选择题 问题： 通信机房门禁安全管理中，外来通信技术人员进出通信机房，必须由（）陪同下方可进入。A.站场当班人员B.站场管理人员C.管理处专业人员D.站场负责人
题型：单项选择题 阅读理解。 The moon is the earth's largest and only natural satellite. A satellite is a small body that goes around a planet. The first man-made satellite went into the orbit in 1957. By 1968 there were over three hundred satellites in the orbit. Some satellites send back weather pictures. Others send out radio waves. Some satellites are what we call "junk". In 1963, the United States put millions of small pieces of wire into orbit.They were used to carry radio waves. Many of these wires may still be there. Some space junk was not put in the orbit. For example, one piece of space junk is a glove lost by an astronaut! Space is very big. Does it matter if there is junk in the orbit? Many scientists think so. They say we must pay much attention to how we use this new resource. They think anything man puts into space should be made to come back to earth when its work is done. They say it's dangerous to have space junk,because it's possible for spacecraft to collide with the junk. 1. The first man-made satellite was sent up into space in _____.[ ]A．1957 B．1963 C．1968 D．1975 2. There were satellites in orbit by 1968． [ ]A．less than 300B．about 30 C．more than300D．about300 3. The underlined word "junk" in the first paragraph means _____.[ ]A．飞行物 B．陨星 C．天体 D．垃圾 4. Lots of scientists think that all the space junk should be . [ ]A．kept in space B．used to do something for humans C．made to come back to earth D．put together 查看答案
题型：单项选择题 关于慢性支气管炎的描述，哪项错误（）A.指气管、支气管黏膜的慢性感染性炎症B.主要表现为咳嗽、咳痰或伴喘息C.常并发阻塞性肺气肿D.吸烟是其主要病因E.临床可分为单纯型、喘息型 查看答案