6520电气集中，不允许两端同时向同一无岔区段调车，在电路上是通过（）来实现的。A. 发布时间：2017-06-29 00:44 │ 来源：www.tikuol.com 题型：单项选择题 问题： 6520电气集中，不允许两端同时向同一无岔区段调车，在电路上是通过（）来实现的。A.FKJ B.ZJ C.KJ D.XJJ
题型：单项选择题 There are many international organizations which work to save and protect endangered species and natural environment. If you would like more information about any of the organizations listed blow, you can write to the addresses given.Friends of the Earth (FOE) campaigns on a range of problems including rainforests, the countryside, water and air pollution and energy. Friends of the Earth International Secretariat P. O. Box 19199 1000 G. D.AmsterdamThe Netherlands Greenpeace uses peaceful but direct action to defend the environment. It campaigns to protect rainforests and sea animals, stop global warming and end pollution of air, land and seas. It also opposes nuclear (核) power. Greenpeace International 1016 DW Amsterdam The Netherlands BirdLife international is an organizationwhich works to save endangered birds all over the world BirdLife International Wellbrook CourtGirton RoadCambridge CB3 ONAEnglandWWF-World Wide Fund For Nature is the world’s largest private international organization for the protection of nature and endangered species. Information Officer WWF International Avenue du Mont-Blanc 1196 GlandSwitzerland小题1:If you want to learn more about the organizations, you can .A．call them B．write them a letterC．visit them D．send them an e-mail小题2:Which problem will be paid close attention to by FOE?A．Overhunting ocean animals.B．Killing endangered birds. C．Heavy air pollution. D．Global warming.小题3:If you oppose nuclear power, you can join .A．Friends of the Earth B．World Wide Fund For Nature C．BirdLife International D．Greenpeace小题4:What can we learn about WWF?A．It helps to protect nature and save endangered animals. B．It is the world’s largest international organization.C．It works for private companies and rich people. D．It is a private organization in the United States.小题5:Which is the best title for the passage?A．Endangered animalsB．Global traffic problems C．Environmental protection organizations D．Natural beauty 查看答案
题型：单项选择题 Flow control is a function that prevents network congestion by ensuring that (1) do not overwhelm (2) with data. There are three commonly used methods for handling network congestion. (3) is used by network devices to temporarily store bursts of excess data in memory until they can be processed. (4) are used by receiving devices to help prevent their buffers from overflowing. (5) is a flow -control scheme in which the source device requires an acknowledgment from the destination after a certain number of packets have been transmitted.3（）A．BufferB．Source-quench messagesC．BufferingD．Windowing 查看答案
题型：单项选择题 患者，男，26岁。因急性化脓性阑尾炎合并穿孔，弥漫性腹膜炎在当地医院行急诊阑尾切除术后，自行要求转院，于术后5小时转至市医院。术后4天起，持续发热，有时呃逆，右上腹痛。查体：右肺底呼吸音弱，X线胸透：右膈活动受限，肋膈角少量积液，白细胞20×109/L，首先应考虑A．右侧胸膜炎B．肺不张C．右下肺炎D．膈下脓肿E．门静脉炎肝脓肿 查看答案