应用需求:企业用户在选购打印机时,不仅要求产品具备较高的打印质量和打印速度,同时对产品在使用过程中的成本支出也十分关心。同时,为适应打印市场的需求,打印机需要既能实现彩色打印功能,又要具备网络连接功能。应用环境:HP Color Las...应用需求:企业用户在选购打印机时,不仅要求产品具备较高的打印质量和打印速度,同时对产品在使用过程中的成本支出也十分关心。同时,为适应打印市场的需求,打印机需要既能实现彩色打印功能,又要具备网络连接功能。应用环境:HP Color LaserJet 4650dtn是一款A4幅面彩色激光数码打印机,标配网络及USB 2.0接口,具有良好的可扩展性,可实现彩色和黑白同速打印。产品标配自动双面打印器,可实现自动双面打印功能,有效降低了成本。展开更多
The crop types and agricultural characteristic are reconstructed using the archaeobiological proxies of pollen, seed and phytolith at Xishanping site in Gansu Province between 5250 and 4300 cal a BP. The agricultural ...The crop types and agricultural characteristic are reconstructed using the archaeobiological proxies of pollen, seed and phytolith at Xishanping site in Gansu Province between 5250 and 4300 cal a BP. The agricultural activity strengthened in Xishanping from 5100 cal a BP. It appeared the earliest cultivation of prehistoric rice in the most northwest China at 5070 cal a BP. The sudden disappearance of conifers and expansion of chestnut trees is likely to be the result of selective hewing of conifers and cultivation of chestnuts at about 4600 cal a BP. There existed 8 crop types of foxtail millet, broomcorn millet, rice, wheat, barley, oats, soybean and buckwheat at Xishanping between 4650 and 4300 cal a BP, which cover the main crop types of the two origin centers of East and West Asia. Not only has the wheat and barley been approved to spread to northwestern China, but the earliest complexity agriculture in Neo-lithic China appeared in Tianshui, Gansu Province.展开更多
文摘应用需求:企业用户在选购打印机时,不仅要求产品具备较高的打印质量和打印速度,同时对产品在使用过程中的成本支出也十分关心。同时,为适应打印市场的需求,打印机需要既能实现彩色打印功能,又要具备网络连接功能。应用环境:HP Color LaserJet 4650dtn是一款A4幅面彩色激光数码打印机,标配网络及USB 2.0接口,具有良好的可扩展性,可实现彩色和黑白同速打印。产品标配自动双面打印器,可实现自动双面打印功能,有效降低了成本。
基金Supported by the Innovation Program of the Chinese Academy of Sciences (Grant No. KZCX3-SW-146)the National Natural Science Foundation of China (Grant Nos. 40572108, 40599423 and 40372077)the West Light Foundation of the Chinese Academy of Sciences
文摘The crop types and agricultural characteristic are reconstructed using the archaeobiological proxies of pollen, seed and phytolith at Xishanping site in Gansu Province between 5250 and 4300 cal a BP. The agricultural activity strengthened in Xishanping from 5100 cal a BP. It appeared the earliest cultivation of prehistoric rice in the most northwest China at 5070 cal a BP. The sudden disappearance of conifers and expansion of chestnut trees is likely to be the result of selective hewing of conifers and cultivation of chestnuts at about 4600 cal a BP. There existed 8 crop types of foxtail millet, broomcorn millet, rice, wheat, barley, oats, soybean and buckwheat at Xishanping between 4650 and 4300 cal a BP, which cover the main crop types of the two origin centers of East and West Asia. Not only has the wheat and barley been approved to spread to northwestern China, but the earliest complexity agriculture in Neo-lithic China appeared in Tianshui, Gansu Province.
