chemical

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chemical

1.The main chemical composition of gypsum is（）2.Generally speaking, effective ingredients extracted from natural minerals, animals or plants, as well as drugs obtained by chemi3.The output of chemical fertilizer has been raised 5 times as against last year.4.To keep the ourside of your iPod clean, you should not use window cleaners, household cleaners, or other chemical cleaners.5.The chemical compositions of the four ashes, obtained （） EDX data, are shown in Fig. 1.6.It is necessary to list the chemical and physical properties of all samples .7.There is a chemical cross-linking in the rubber network of thermoplastic rubbers.8.Most cast irons have a chemical composition of（）percent carbon.9.A chemical causes nervousness is called adrenaline.