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- The main chemical composition of gypsum is（）
- Generally speaking, effective ingredients extracted from natural minerals, animals or plants, as well as drugs obtained by chemi
- The output of chemical fertilizer has been raised 5 times as against last year.
- To keep the ourside of your iPod clean, you should not use window cleaners, household cleaners, or other chemical cleaners.
- The chemical compositions of the four ashes, obtained （） EDX data, are shown in Fig. 1.
- It is necessary to list the chemical and physical properties of all samples .
- There is a chemical cross-linking in the rubber network of thermoplastic rubbers.
- Most cast irons have a chemical composition of（）percent carbon.
- A chemical causes nervousness is called adrenaline.