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《Reading and vocabulary》新课标PPT课件优质课下载
B. The Reaction of Metals
C. The Reaction of Metals with Oxygen
Skimming
rust
Stage A
(starting experiment)
Stage B
(1 week later)
Stage C
(Conclusion)
Iron in ordinary water
Iron in air-free water
Iron in dry air
water
nails
Iron does
not rust.
Iron does
not rust.
Iron rusts.
cotton
wool
water
water
water