John Hancock Center is an experiment in engineering in terms of using()for the first.
A.glass wall
B.exoskeleton
C.structural steel
D.tower crane
正确答案:exoskeleton
John Hancock Center is an experiment in engineering in terms of using()for the first.
A.glass wall
B.exoskeleton
C.structural steel
D.tower crane
正确答案:exoskeleton