, Bell’s tetrahedron shape has proved invaluable in the design of bridges. A. To be stabl——青夏教育精英家教网—

摘要： , Bell’s tetrahedron shape has proved invaluable in the design of bridges. A. To be stable B. Being stable C. Stable D. Having been stable

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______, Bell’s tetrahedron shape has proved invaluable in the design of bridges.

A. To be stable B. Being stable

C. Stable D. Having been stable

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