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If the temperature of City A is -20 ""^(...

If the temperature of City A is -20 `""^(@)C` and the temperature of City B is 10 `""^(@)C`, the difference in temperature between the two cities is

A

`-30" "^(@)C`

B

`-10" "^(@)C`

C

10 `""^(@)C`

D

30 `""^(@)C`

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