本题目来源于试卷: Physics Unit14: Heat，类别为 国际高中通用物理
[单选题]
A layer of insulating material 7kox,n/cqw0w ssv7 d:with thermal conductivity K isbs- u lb,m*u.q placed on a layer of another material of theru,uqb ls-*.m bmal conductivity 2K. The layers have equal thickness. What is the effective thermal conductivity of the composite sheet?
A. $3 \; K$
B. $1.5 \; K$
C. $K/3$
D. $2K/3$
参考答案: D
本题详细解析:
暂无
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