题目内容：
锅炉的受热面上结有水垢后，由于水垢的导热性能比金属性能差（），就会影响锅炉的传热效率。A．几倍
B．十几倍
C．几十倍
D．百倍
参考答案：
单选：锅炉的受热面上结有水垢后，由于水垢的导热性能比金属性能差（），就会影响锅炉的传热效率。
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A．几倍
B．十几倍
C．几十倍
D．百倍
A．几倍
B．十几倍
C．几十倍
D．百倍
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