【正文】 re trees in drought resistance. In the right amount at the right time in growing with post, irrigation, promoting tree growth, tree sugar accumulation of nutrients in the body and can enhance the tree39。 vigorously growing lawn in the heat and severe drought situations, need to pay 5060mm per week or more. In General, regardless of the method, should be irrigated more than once, each time less water, maximum surface runoff that just occurred. 2, fertilizing to maintain lawn dark green leaves, grows, portions must be fertilized. Lawn plants for leaf growth and blossomfree requirements, so nitrogen is more important, response to nitrogen fertilizer is the most obvious. Should be basic application in building lawn, lawn built in growing season required after applying fertilizer. Cold season grass dressing time is best in early spring and fall. After the first green, can play a role in facilitating the growth of second in spring, after the weather turned hot, you should stop dressing. Fertilization in autumn on 9, October. Applies fertilizer the time is late spring of warmseason grasses. In a month or 2 months of growing season to be caught up with fertilizer. Increasing the density of foliage, improve resistance to stepping on. Fertilizing should not be late for the last time in midSeptember. 3, trim Pruning is the focus of lawn maintenance, but is the most intensive work. Trim control lawn height of the tillers, increasing the density of leaves, weeds and lawn neat and beauty. General lawn trimmed at least 45 times a year, prune and trim the number of height is related to two factors. Lower the cutting height requirements, pruning more times. Leaves of grass density and coverage also increases with the number of trim and more. It should be noted that in accordance with regular mowing the grass cutting height, when up to times the height of the grass, trim twice times the maximum shall not exceed the specified height. 4, weed weed invasion will seriously affect the quality of the lawn, turf lost uniform and neat appearance and purpose weed and grass petition for water, fertilizer, race the Sun, so that objective grass growth decline, so weed is an essential part of lawn maintenance and management. The fundamental methods of weed prevention and removal is the rational management of water and fertilizer, grass growth promotion purposes, increase petitiveness with weeds, and multiple trim, suppress weeds. Case against weeds, in addition to using artificial rejects, I also use chemical herbicides, such as killing dicotyledonous weeds with class。 Division of labor and cooperation, so that the working groups towards the direction of professional development to ensure corporate goals and conservationComponent objectives of coordination, collaboration on the various functions of the body in action, coordination between the functional departments and managers, the entire management organizations to ensure that capable, efficient, multifunctional. Under the Chongqing Municipal landscaping management standards and the technical specifications of urban landscaping projects adopt the following approach working mechanism. Will this unit dedicated to the conservation section is divided into four groups: the trees and shrubs to the conservation group (responsible for measures such as the shading)。. When turning the motor over current or rotor disc doesn39。there? 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Try discussing switching operations should focus on preventing misoperation accident? New operation or after majorrepair of transformers why test? Try discussing steps measured with a Megger insulationresistance of electrical equipment? Lu method is used to find DC grounding considerationarewhat? when there are two point grounding with the polarity should be ... supercritical supplementary questions, blank mini disk can be divided into manual and two oil turbine。 oil turbine disc wheel car, the turning speed of the rotor can be controlled at around 80~120 RPM (high speed), and it is fulfilled by controlling access to the oilpressure turbine oil turni