【導讀】只有一個是符合題目要求的，錯選、多選或未選均無分.，利用微分的不變性得：。yx用極坐標表示分。r；故積分區(qū)域D在極坐標系系下為。，這是一階線性非齊次微分方程，設原方程有通解xexxCy12)(?在],[21xx有意義，從而)(xf在。],[21xx上滿足拉格朗日中值定理的條件，在],[ba上連續(xù)，根據(jù)連續(xù)函數(shù)在閉區(qū)間上最值定理知，)(xf?有最大值又有最小值，不妨設Mm,分別是最小值和最大值，從而),(bax?,這是調(diào)和級數(shù),發(fā)散的；,這是交錯級數(shù),滿足萊布尼茲定理的條件,收斂的.所以級數(shù)的收斂域為?

　　

【正文】 be too strict. Remember in Dongguan Street, 400 meters long cement concrete surface layer, because of various reasons, the smoothness of the poor in the bottom cavity, covering film traces and car imprinting quality problems, * * * inquiries, immediately rushed to the scene to understand and verify the situation, the convening of the management office, the construction units, supervision units, construction units, construction units construction time is tight, the economic loss and other reasons to intercede ******** unmoved. He said, now a popular word, to the discipline and rules quite in front, there are no rules Radius, you construction team not accordance 23 with the technical specifications, quality problems, it must be to carry out rectification. Engineering quality responsibility be weightier than Mount Tai, if we manage to this matter Pavement quality quantity are placed the matter, we this time to learn two regulations have what use? Still what is the Communist Party? Finally, in his insisted, the road after rework, to solve these problems. In the construction of the new rades and the project all the colleagues efforts, after four months of fighting, the project the main project was finally pleted and passed inspection. Thousands of miles of ice, thousands of miles Piao, this is a splendid and romantic scene. But snow for the highway, it is a disaster, a serious threat to the traffic safety. This year, a month, a century of cold wave swept from North to south, and the snow blowing to Guangdong, but also to bear the blow To * * * * the highway. In January on the evening of 23, Lianping county city temperatures dropped to minus 2 degrees, a wide range of sudden rain sleet, before and after the provincial S341 line in Jiulianshan Mountain tunnel sections of the road appeared in the snow, lead to the passing vehicles skid, traffic is blocked. In the face of the sudden natural disasters, city and county 24 highway department immediately launched the emergency plan for disaster prevention. As the front line of the main force, Lianping Highway Bureau of all Party members and cadres to remember the Party member responsibility, braving the biting cold wind, the first time rushed to the scene, on the icy pavement of salt disposal. Because the temperature is too low, just melt water immediately freezes, addition to the ice work to increase the difficulty. To ensure In addition to the re anization of the depths of the traffic safety, road people braved the icy put reflective cones and warning signs, endure cold at minus 2,3 of Jiulianshan patrols until one in the morning. Just before dawn, Lianping Highway Bureau personnel on the icy road salt ice melting processing until ten o39。clock, ice melting ice success, the road gradually returned to normal traffic. In the cold winter night, which people do not miss the warm bed, which people do not miss the warm home. However, our highway on the road to the owners of the masses can go home early, the night fighting to secure the avoidance of the road safety and smoothness, fulfill their responsibility. Xi General Secretary Every Party member cadre cautioned against said: blacksmith needs self hard . two regulations , is our own hard standard test, more exercise every party members and 25 cadres of the fire. We should continue to strengthen the party two regulations, conscientiously in practical work, practical play road, the road for the development of the cause of Heyuan and struggle. In the industry domain report the situation of road traffic in recent years, in the province highway departments of the concern and support, our bureau management department based on the job, loyalty duty, best service, to further promote the highway management standardization, legal, scientific and information technology to improve the management level and service quality. This will be my last work is as follows: first, around the center, go all out to greet the seizure in 2020, meet national examination is my bureau work. As the highway management department, we focus on the work of the center to strengthen road renovation and management as the focal point, further optimize the service environment, improve service levels. Inspection, the inspection group and the Ministry of transport, the Bureau under the leadership of the ministries and agencies highly evaluated and fully affirmed. (a) increase road area remediation efforts. The programme of work, strengthen the anization and leadership. The timely 26 development of the city of *** mon trunk highway area environment remediation plan , along the road signs and markings, traffic safety facilities, on both sides of the green, advertising signs, control area illegal construction and implementation of remediation tasks to the relevant departments, clear work time of the node to ensure rectification work timely. Set up road area special rectification work leading group, implement a bureau, the Bureau of the county (District), the project road site domain environment prehensive improvement Mechanism. To ensure that the work carried out smoothly, the bureau also anized the city road managers participated in the regulation of road region and the relevant laws and regulations of the special training. 2. Active butt joint is reported, actively strive for the support of. Local Party mittee and government support is the job As a magic weapon, I am one of the Bureau of the principal leaders repeatedly attack inspection remediation and road area to the principal leaders of the municipal report. * * *, the Secretary of municipal Party mittee, mayor * *, * * *, vice mayor of many times the rate of the relevant departments directly under the responsible person indepth National 27 Highway G105 line, G205 line, provincia