由(1)得:x≥12;
由(2)得:x<34.
故此不等式组的解为12≤x<36.
I'll go to the library as soon as I finish what I _____.[ ]
A. was doing
B. am doing
C. have done
D. had been doing
道床支承块由厂家在工地按工厂化标准预制,混凝土配合比由(),钢筋、水泥、骨料、水、外加剂等符合设计要求。
A.监理工程师确定,混凝土采用强制式搅拌机拌和
B.监理工程师确定,混凝土采用自落式搅拌机拌和
C.工厂试验确定,混凝土采用强制式搅拌机拌和
D.工厂试验确定,混凝土采用自落式搅拌机拌和