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🌐 网址：http://www.fda.gov/ 🎯 适合谁...

High impact medical journal. Champion of better research, clinical practice & healthcare policy since 1840. For GPs, hospital doctors, educators, policymakers.

Healthopedia is an independent health information resource, created to help you easily research common health problems, conditions and solutions online.

🌐 网址：http://f1000.com/ 🎯 适合谁：科...

Advancing excellence, connecting chemical scientists and shaping the future of the chemical sciences for the benefit of humanity.

ACS is one of the world’s largest scientific societies and the premier home of chemistry professionals. Find career opportunities, educational resources, professional development, and much more.

Explore the chemical elements through this periodic table

The definitive online periodic table reference site including technical data, and photographs and descriptions of thousands of samples of the chemical elements.

Daily science news on research developments, technological breakthroughs and the latest scientific innovations

🌐 网址：http://www.iop.org/ 🎯 适合谁...

Join Physics Forums, where students, scientists, and enthusiasts come together to explore and discuss the current understanding and practice of various...