无标底的综合评分法常采用( )作为标准值。
A．最高报价
B．最低报价
C．平均报价
D．评标价
E．复合标底
参考答案：B,C
I was told that although these old buildings _______ the Qing Dynasty, they remained in good condition.
A．are dated back to
B．dated back to
C．dating back to
D．have dated back to
黑膏药基质的原料有（）
A.植物油
B.官粉
C.红丹
D.雄黄
E.朱砂
