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NORTHERN POWER COMPANYBox 2980 Yellowknife, NWT, XIA 2R4Applications are invited from students in two, three, or four-year technical programs who are seeking three months of well-paid summer employment. The work will include construction of living quarters and associated(相关的) facilities in the Northwest Territories and Yukon. Terms of employment will be:13 full weeks—June 10 to September 10Excellent pay’ $475 per weekTransportation: PaidAccommodation (食宿): PaidStudents interested in this work are to write to Ms. Sheena O’Connell at the above address. Although previous experience in construction work is not essential, knowledge of general construction methods will be considered a valuable quality for some positions. What is the job advertised The（）of houses.
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Pesticides (杀虫剂) Why do pesticides(杀虫剂)fit into the picture of environmental disease We have seen that they now pollute soil, water and food, that they have the power to make our streams fishless and our gardens and woodlands silent and birdless. Man, however much he may like to pretend the contrary, is part of nature. Can he escape a pollution that is now so thoroughly distributed throughout our world We know that even single exposures(暴露)to these chemicals, if the amount is large enough, can cause extremely severe poisoning. But this is not the major problem. The sudden illness or death of farmers, farm workers and others exposed to sufficient quantities of pesticides are very sad and should not occur. For the population as a whole, we must be more concerned with the delayed effects of absorbing small amounts of the pesticides that invisibly pollute our world. Responsible public health officials have pointed out that the biological effects of chemicals are cumulative(积累的) over long periods of time, and that the danger to the individual may depend on the sum of the exposures received throughout his lifetime. For these very reasons the danger is easily ignored. It is human nature to shake off(摆脱) what may seem to us a threat of future disaster. "Men are naturally most impressed by diseases which have obvious signs", says a wise physician, Dr. Rene Dubos, "yet some of their worst enemies slowly approach them unnoticed. \ What is the author’s attitude towards the environmental effects of pesticides
Pesticides (杀虫剂) Why do pesticides(杀虫剂)fit into the picture of environmental disease We have seen that they now pollute soil, water and food, that they have the power to make our streams fishless and our gardens and woodlands silent and birdless. Man, however much he may like to pretend the contrary, is part of nature. Can he escape a pollution that is now so thoroughly distributed throughout our world We know that even single exposures(暴露)to these chemicals, if the amount is large enough, can cause extremely severe poisoning. But this is not the major problem. The sudden illness or death of farmers, farm workers and others exposed to sufficient quantities of pesticides are very sad and should not occur. For the population as a whole, we must be more concerned with the delayed effects of absorbing small amounts of the pesticides that invisibly pollute our world. Responsible public health officials have pointed out that the biological effects of chemicals are cumulative(积累的) over long periods of time, and that the danger to the individual may depend on the sum of the exposures received throughout his lifetime. For these very reasons the danger is easily ignored. It is human nature to shake off(摆脱) what may seem to us a threat of future disaster. "Men are naturally most impressed by diseases which have obvious signs", says a wise physician, Dr. Rene Dubos, "yet some of their worst enemies slowly approach them unnoticed. \ In the author’s view, the sudden death caused by exposure to large amounts of pesticides______
如果多个事务在某个调度的执行结果与这些事务在某个串行调度下的执行结果相同，则称这个调度为 【13】 。
当6～35KV变压器壳内故障产生轻微瓦斯或油面下降时，应瞬时动作于跳闸。( )
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