33. Celsius temperature multiplied by $\qquad$, and then plus $\qquad$, is the value of Fahrenheit temperature. The Fahrenheit scale is commonly used in European and American countries and is the world's first practical empirical temperature scale.
A. $1.7,31$
B. $1.8 、 32$
C. 1.8、31
D. $1.7,32$
【Answer】B
【Analysis】Fahrenheit and Centigrade are both units used to measure temperature. The Celsius scale has been incorporated into the International System of Units. Many countries, including China, use Celsius, while the United States and some other English-speaking countries use Fahrenheit less frequently. The Celsius scale defines that the temperature of an ice-water mixture is set at $0^{\circ} \mathrm{C}$, and the boiling point of water is set at $100^{\circ} \mathrm{C}$, with 100 equal divisions between them, each division being one unit of Celsius, called 1 degree Celsius. The Fahrenheit scale defines that under standard atmospheric pressure, the melting point of ice is $32^{\circ} \mathrm{F}$, and the boiling point of water is $212^{\circ} \mathrm{F}$, with 180 equal divisions between them, each division being one unit of Fahrenheit, called 1 degree Fahrenheit. Celsius was invented by the Swedish astronomer Anders Celsius, and Fahrenheit was invented by the German Gabriel D. Fahrenheit; their symbols are different, Celsius: ${ }^{\circ} \mathrm{C}$, Fahrenheit: ${ }^{\circ} \mathrm{F}$. The conversion relationship between the Celsius scale (C) and the Fahrenheit scale (F) is: $\mathrm{F}=\mathrm{C} \times 1.8+32$, $\mathrm{C}=(\mathrm{F}-32) \div 1.8$.