| The difference between a liquid and a
gas is obvious under the conditions of temperature and pressure commonly found
at the surface of the Earth. A liquid can be kept in an open container and fill
it to the level of a free surface. A gas forms no free surface but tends to
diffuse(扩散)throughout the space available; it must therefore be kept in a closed
container or held by a gravitational field, as in the case of a planet’s
atmosphere. The distinction was a prominent feature of early theories describing
the phases of matter. In the nineteenth century, for example, one theory
maintained that a liquid could be" dissolved" in a vapor without losing its
identity, and another theory that held the two phases are made up of different
kinds of molecules. liquids and gases. The theories now prevailing take a quite
different approach by emphasizin A. The Properities of Gases and Liquids. B. What Fluids and Gases Are Made of. C. New Uses for the Gas and the Liquid. D. New Theories about Fluids and Gases. [单项选择]
Cigarettes can seriously damage your countryside. Fanned by 112km/h Santa Ana winds, fire swept across 4,250 hectares near the mountain community of Alpine, California. More than 650 people were (1) immediately from their homes. As 800 firefighters (2) to control the conflagration (a large, destructive fire 大火), (3) of smoke (4) over 9,000m and sent clouds of (5) drifting across San Diego, nearly 50km away. A (6) of air tankers (a cargo plane carrying water or fuel 运送水或燃料的飞机) and helicopters (7) water and fire-retarding (8) over the area. Firefighters believe the (9) was started by a (10) discarded cigarette. California, (11) raining at this time of year, had only 1mm of precipitation (rain; a quantity of rain in a specific area at a specific time) in December, making (12) the state’s (13) winter month in 70 years. In the 1970’s (14) homes and ranches in the mountains n [判断题]做好经常性思想工作,要经常分析指战员现实思想,对问题苗头及时发现、准确掌握、正确处理。( )
A.正确 B.错误 [单项选择]滚动轴承装配在轴上时采用（）制。
A. 过渡 B. 过盈 C. 基轴 D. 基孔 [多项选择]下列哪些措施有利于减少心肌缺血的发生（）
A. 术前治疗高血压 B. 纠正病人贫血 C. 使用全麻 D. 术中维持血流动力学平稳 E. 避免心动过速 [单项选择]下列疾病是以颜色命名的是
A. 鹅掌风 B. 丹毒 C. 漆疮 D. 黄水疮 E. 烂疔 [判断题]实际偏差的数值一定为正值。
A.正确 B.错误 [多选题]人工模式下，门选开关故障将会造成什么影响。
A.无法牵引 B.不能关门 C.不能开门 D.紧急制动不缓 E.PWM信号无法发出 [单项选择]一方希望和他人订立合同的意思表示，在性质上属于( )。
A. 要约邀请 B. 要约 C. 承诺 D. 合同 [单选题]某单位的人事管理程序属于（）
A.系统程序 B.系统软件 C.应用软件 D.目标软件 [单选题]1984年1月22日到2月17日，邓小平视察珠海、深圳等经济特区和广州、上海。在珠海，邓小平提笔写下了（）。
A.经济特区发展好 B.珠海经济特区好 C.经济特区搞得好 D.珠海发展好 我来回答: 提交
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