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A refractory material is one that retains its strength at ...
This term describes a blade shape pioneered in America ...
Helicopters have a rotor turned by an engine-driven shaft. ...
Partial annealing is also referred to as interstitial ...
Located at the north rim of the Grand Canyon, Walhalla ...
Li Shizhen who writes the Bencao Gangmu said that: tea is ...
The Eiffel Tower is an iron lattice tower located on the ...