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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