• 2022-05-27 问题

    Comparing with normal concrete, lightweight concretes cannot be used for their thermal insulation.

    Comparing with normal concrete, lightweight concretes cannot be used for their thermal insulation.

  • 2022-05-31 问题

    The walls consist of A: 3 huge sheets of glass and concrete B: 3 huge pieces of concretes with small windows C: only 3 huge sheets of glasses

    The walls consist of A: 3 huge sheets of glass and concrete B: 3 huge pieces of concretes with small windows C: only 3 huge sheets of glasses

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