【Daily Question】Question from Issue 20151027
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Participation reward: 2 Wealth. Reward for correct answer: 9 wealth. In the following comparison of different radiators, which conclusion is incorrect? ( ). (A) Manufacturing cast iron radiators requires more metal than manufacturing steel radiators. (B) Heating systems that use steel radiators or cast iron radiators should all employ a closed-loop system. (C). Under the same conditions of water supply volume, supply and return water temperatures, and room temperature, the surface temperature of the steel single-plate flat-tube radiator is higher than that of the steel single-plate flat-tube radiator with convective fins. (D). When the oxygen content in the water used for filling the heating system is high, the lifespan of steel radiators is shorter than that of cast iron radiators. 【Production and Management Division】Seeking moderators and technical discussants to join
In the following comparison of different radiators, which conclusion is incorrect? (B) Heating systems that use steel radiators or cast iron radiators should all employ a closed-loop system. ). Only steel radiators should use a closed system
B Heating systems that use steel radiators or cast iron radiators should all employ a closed-loop system.
B、--------------------------------------------------------Only steel radiators use a closed-loop system
(B) Heating systems that use steel radiators or cast iron radiators should all employ a closed-loop system.
In the following comparison of different radiators, which conclusion is incorrect? (B). (A) Manufacturing cast iron radiators requires more metal than manufacturing steel radiators. (B) Heating systems that use steel radiators or cast iron radiators should all employ a closed-loop system. (C). Under the same conditions of water supply volume, supply and return water temperatures, and room temperature, the surface temperature of the steel single-plate flat-tube radiator is higher than that of the steel single-plate flat-tube radiator with convective fins. (D). When the oxygen content in the water used for filling the heating system is high, the lifespan of steel radiators is shorter than that of cast iron radiators.
In the following comparison of different radiators, which conclusion is incorrect? (a). (A) Manufacturing cast iron radiators requires more metal than manufacturing steel radiators. (B) Heating systems that use steel radiators or cast iron radiators should all employ a closed-loop system. (C). Under the same conditions of water supply volume, supply and return water temperatures, and room temperature, the surface temperature of the steel single-plate flat-tube radiator is higher than that of the steel single-plate flat-tube radiator with convective fins. (D). When the oxygen content in the water used for filling the heating system is high, the lifespan of steel radiators is shorter than that of cast iron radiators.
In the following comparison of different radiators, which conclusion is incorrect? (C). (A) Manufacturing cast iron radiators requires more metal than manufacturing steel radiators. (B) Heating systems that use steel radiators or cast iron radiators should all employ a closed-loop system. (C). Under the same conditions of water supply volume, supply and return water temperatures, and room temperature, the surface temperature of the steel single-plate flat-tube radiator is higher than that of the steel single-plate flat-tube radiator with convective fins. (D). When the oxygen content in the water used for filling the heating system is high, the lifespan of steel radiators is shorter than that of cast iron radiators.
In the following comparison of different radiators, which conclusion is incorrect? (C). (A) Manufacturing cast iron radiators requires more metal than manufacturing steel radiators. (B) Heating systems that use steel radiators or cast iron radiators should all employ a closed-loop system. (C). Under the same conditions of water supply volume, supply and return water temperatures, and room temperature, the surface temperature of the steel single-plate flat-tube radiator is higher than that of the steel single-plate flat-tube radiator with convective fins. (D). When the oxygen content in the water used for filling the heating system is high, the lifespan of steel radiators is shorter than that of cast iron radiators.
Answer: B. Only heating systems with steel radiators should use a closed-loop system.