在使用POLYCOM 7000s召开视频会议时，以下哪些操作会出现本地会场听到自己发出的声音（）。

[单选题]Passage3        Questions 11 to 15 are based on the following passage.        Many of the most damaging and life threatening types of weather, such as torrential rains and severe thunderstorms, begin quickly, strike suddenly, and disappear rapidly, destroying small regions while leaving neighboring areas untouched. (79) Conventional（普通） computer models of the atmosphere have limited value in predicting short-lived local storms because the available weather data are generally not detailed enough to allow computers to see clearly the small atmospheric changes that come before these storms.In most nations, for example, weather-balloon observations are taken just once ever3r twelve hours at location typically separated by hundreds of miles. With such limited data, conventional forecasting models do a much better job predicting general weather conditions over large regions than they do forecasting specific local events.      Until recently, the observation-intensive approach needed for accurate, very short range forecasts, or "nowcasts", was impracticable. The cost of equipping and operating many thousands of conventional weather stations was extremely high, and the difficulties involved in rapidly collecting and processing the raw weather data from such a network were beyond overcoming.Fortunately, scientific and technological advance have overcome most of these problems. Radar systems, automated weather instruments, and satellites are all capable of making detailed, nearly continuous observations over large regions at a relatively low cost. Communication satellites can transmit data around the world cheaply and immediately, and modern computers can quickly compile and analyze this large volume of weather information. (80) Meteorologists（气象学家）and computer scientists now work together to design computer programs and video equipment capable of transforming r.aw weather data into words, symbols, and vivid graphic displays that forecasters can interpret easily and quickly. As meteorologists have begun using these new technologies in weather forecasting offices, nowcasting is becoming a reality.13 Nowcasts used to be impracticable because______.

[单选题]以下四种能源产品中，属于二次能源的是（　　）。[2009年初级真题]

[多选题]房地产不论是作为一类资产或作为一种商品，其市场价格要受到许多因素的影响，这些因素为（）

[单选题]抑郁症的中医通路，最贴合实际的是（）

[问答题]空调设计采用多联机系统，选用的设备容量大于提供的计算负荷，如何审查？

[单选题]金库由专（兼）职守库人员每日（）双人武装守护。

[单选题]旅馆工作人员发现违法犯罪分子、形迹可疑人员和被公安机关通缉的罪犯，未向当地公安机关报告、知情不报的，公安机关可酌情给予警告或处以（）罚款，情节严重构成犯罪的，依法追究刑事责任。

[填空题]输精管分段分为_________、_________、____________和________。

[多选题]下列哪些属于银行间市场的特点（）

[单选题]下列对注射用油的质量要求描述不正确的是（）