信用社会计档案保管期为十五年的有（）
A、联行往来核算资料
B、会计凭证及附件
C、密押表使用保管记录
D、对账单
参考答案：B
变风量空调系统的优点是（）。
A.耗能
B.简单
C.节能
D.增加新风
She admitted that she had hidden the evidence because she loved him and wanted to him trouble.
A．keep;out
B．keep;out of
C．keep;up
D．keep;into
