问题
填空题
层的相互独立性是指（）。
答案
参考答案：修改其中的任一层却不会影响其余任何一层
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层的相互独立性是指（）。
参考答案：修改其中的任一层却不会影响其余任何一层
| 选词填空，并注意词形变化。 | |
2. The windows came from old buildings that were being _____. 3. The roof is _____ discarded tiles. 4. She recently _____ from the Help Save Our Planet Society. 5. She sold them to _____ for the Children's Hospital. |