在评价项目节水方案时,应对单位产品水耗进行比较,比较的基准一般有()
A.国内平均水平
B.国内先进水平
C.企业原有水平
D.其他企业水平
E.国际水平
参考答案:B, C, E
______ the houses were knocked down in the earthquake.
A.A great many
B.The number of
C.A great many of
D.A great deal of
胰腺癌诊断要点