B. buildings are made from a set of standardized units
C. similar buildings can be produced
D. all units are produced on the site
4. The usual fixed length in the modular system is_______.
A. twenty centimeters B. ten millimeters
C. fifty centimeters D. ten centimeters
5. What lifts the concrete panels onto the building?
A. Cranes. B. Man-power.
C. Pulleys. D. Hydraulic jacks.
参考答案: 1. A 2. C 3. B 4. D 5. A
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