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A. Knot

B. Ohm

C. Calorie

D. Decibel

A. Increase steadily

B. First decreases, then increases

C. First increases, then decreases

D. Decrease steadily

A. Oxygen

B. Helium

C. Hydrogen

D. Nitrogen

A. Salt

B. Calcium

C. Formalin

D. Sugar

A. Bronze

B. Zinc

C. Gold

D. Tin

A. Ligament

B. Epidermis

C. Epiglottis

D. Cartilage

A. Depend upon the weather

B. Remain the same

C. Decrease

D. Increase

A. Alcohol

B. Lime

C. Oxalic Acid solution

D. Kerosene oil

A. Citric acid

B. Ascorbic acid

C. Tartaric acid

D. Tartaric acid

A. Nitrogen dioxide

B. Nitric oxide

C. Nitrogen pentoxide

D. Nitrous oxide