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: A C B D A
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