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必修1《Reading and vocabulary》精品PPT课件优质课下载
test tubes
air-free water
ordinary water
water
cups
hands
A Simple Scientific Experiment
II. Apparatus:
3 clean iron nails
oil
Bunsen burner
test tube holder
cotton wool
test tubes
A Simple Scientific Experiment
A Simple Scientific Experiment
3 clean iron nails
test tubes
test tube holder
cotton wool
oil
Bunsen burner
III. Method
put…into/in
add…to