He an important part in putting out the fire. [ ]
A. played
B. took
C. made
D. had
答案:A
混凝土强度检验评定标准(GB/T50107-2010):当样本容量为12组时,其强度评定时合格评定系数λ1取值应为().
A、0.85
B、0.95
C、1.05
D、1.15
适宜用于化学法测定蛋白质的尿液 pH为
A.1~3
B.2~4
C.5~6
D.7~9
E.8~10