远红外干燥可节约电A. 10% ? 20% B. 20% ?30% C. 20% ?40% D. 20% ?50% E. 20% ?60%

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问题 远红外干燥可节约电

选项 A. 10% ? 20%
B. 20% ?30%
C. 20% ?40%
D. 20% ?50%
E. 20% ?60%

答案D

解析
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