住宅管道有热胀冷缩现象，应在适当部位采取各种补偿措施。
参考答案：对
已知各项均为正数的等比数列{an}，a1•a9=16，则a2•a5•a8的值（ ）
A．16
B．32
C．48
D．64
He likes reading very much．Most of his money on books．
A．is spent
B．spend
C．spends
D．are spent
