Home Products Onboard Security Saloon Camera MD9560-H (2.8 mm) MD9560-H (2.8 mm)2MP Mobile Dome Network CameraFast AE for Quick Adaptation to Light Changes Weather-proof IP66/IP67 & Vandal-proof IK10 Built-in IR Illuminators, effective up to 20 Meters Built-in 802.3af Compliant PoE EN50...
Reviews the book `The Future of the Mass Audience,' by W. Russell Neuman. SD Reese,D Carothers - 《Journalism Quarterly》 被引量: 8发表: 1992年 The future of the mass audience < 1 //j W. RUSSELL NEUMAN Page 2. Page 3. The Future of the Mass Audience focuses onhow the changing ...
汛期潼关河床冲刷主要发生在洪水期,平水期微淤或处于冲淤相对均衡状态.洪水水沙组合情况是决定潼关河床是否发生冲刷的基本条件,河床边界条件对洪水冲刷产生影响.1 974年以来,使河床发生冲刷的洪峰占69%,潼关高程升降值一般小于0.30 m;使潼关高程下降0.5 m以上的主要是流量大于5 000 m3/s的各级含沙量洪峰;使潼关高程...