B. buildings are made from a set of standardized units
C. similar buildings can be produced
D. all units are produced on the site
24. The usual fixed length in the modular system is_______.
A. twenty centimeters B. ten millimeters
C. fifty centimeters D. ten centimeters
25. What lifts the concrete panels onto the building?
A. Cranes. B. Man-power.
C. Pulleys. D. Hydraulic jacks.
21. A 22. C 23. B 24. D 25. A
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