鲜牛奶的蛋白质平均含量一般为()。
A.1%
B.2%
C.3%
D.4%
E.5%
参考答案:C
After a fire broke out in the lab,a lot of equipment _________. [ ]
A.is damaged
B. had damaged
C. damaged
D. was damaged
编制单位工程施工图预算要依据()。
A、概算定额
B、预算定额
C、施工定额
D、概算指标