导热系数,是指单位面积、单位厚度的材料,当两面温差为()时,在单位时间内传导的热量
A.1K
B.2K
C.3K
D.5K
参考答案:A
.Throughout _______ history, English has undergone big changes, especially when Henry IV
became _______ King of England.
A.the, the
B./, /
C.the, /
D./, the
详细可行性研究阶段对建设投资估算的精度在±10%。( )