下列双代号网络图中体现工作之间组织关系的工作是()
A.钢筋1和钢筋2
B.钢筋1和模板1
C.模板1和钢筋2
D.模板2和混凝土2
参考答案:A
The book was written in 1946, ____ the education system has witnessed great changes.
A.when
B.during which
C.since then
D.since when
安装防抱死制动装置(ABS)的车辆制动时,制动距离没有变化。