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Your Source for Science Supplies and Laboratory Equipment. If you are a Company, School or University we also accept Purchase Orders. We sell new equipment for all your science and educational needs. With the addition of our brand new online shopping facility, ordering could not be more convenient, easy and secure. PRODUCTS BEING SOLD ARE NOT TOYS. THEY ARE NOT FOR USE BY CHILDREN 12 and UNDER. Click here to view our new e-catalog.
Ответы на вопросы по естественно-научным дисциплинам и математике. Если накрест лежащие углы при секущей равны, то прямые параллельны. Пусть даны две прямые a и b, которые пересекаются прямой c. То есть прямая c является секущей для прямых a и b. При этом образуются две пары накрест лежащих углов. Если в любой из этих пар углы равны, то прямые a и b параллельны. На чертеже обозначена одна пара равных между собой накрест лежащих углов.
founded in 1997 and it combines the resources, experience and the competitive pricing with the flexibility, responsiveness and hands-on personalized service for total business solutions. Dedicated to developing creative, effective technology solutions, be focus on making your organization, project or event, professional, impressive and trouble-free.
founded in 1997 and it combines the resources, experience and the competitive pricing with the flexibility, responsiveness and hands-on personalized service for total business solutions. Dedicated to developing creative, effective technology solutions, be focus on making your organization, project or event, professional, impressive and trouble-free.
La obsolescencia programada es un fenómeno inventado -como no- en EEUU para favorecer el consumismo. Consiste en reducir intencionadamente la vida útil de las cosas, para obligar a los consumidores a adquirir nuevos productos. Esto, además de insostenible ecológicamente, inmoral. La obsolescencia es uno de los pilares del capitalismo, y es una de las mayores lacras del planeta. Por un lado, el proces.