[多选题]电客列车司机驾驶列车在区间运行中，应认真瞭望并确认前方（）情况，发现影响 行车安全情况时，立即采取
A.A.进路
B.B.信号
C.C.道岔
D.D.线路

The history of civil engineering is a very important story in the development of civilization. Civil engineers began practicing their profession four thousand years ago.Every great civilization, Egyptians, Minoan, and Roman, for instance, had the civil engineers. What is left of their work is proof that they were intelligent. These engineers of the ancient world built entire cities. They de signed systems of pipes which supplied fresh water. They built water pipelines for farmlands as well as bridges of great length. The ruins of the structures tell us much about the work of early engineers.
Consider the pyramids of Egypt. They are evidence that some of the earliest engineers had great scientific ability. They are also proof that those engineers could make lasting works of art and des(gm Although they lived thousands of years ago,the Egyptian engineers used very exact measurements. The base of the largest pyramid, the great pyramid near Gizeh,comes to within inche
A. building materials were broken into smaller pieces of all sizes
B. there were no requirements for the size and shape of building materials
C. Egyptian engineers were not concemod with the size and shape of the building materials
D. building materials were processed to meet certain requirements for their size and shape