|物体|导体|绝缘体|
|----|----|----|
|石头| |
|书本| |
|塑料直尺| |
|金属直尺| |
|铅笔外壳| |
|铅笔芯| |
|书包| |
|钥匙| |
|玻璃杯| |

|----|----|----|
|石头|
√
||书本|
√
||塑料直尺|
√
||金属直尺|
√
||铅笔外壳|
√
||铅笔芯|
√
||书包|
√
||钥匙|
√
||玻璃杯|
√
|
答案:
|物体|导体|绝缘体|
|----|----|----|
|石头| |√|
|书本| |√|
|塑料直尺| |√|
|金属直尺|√| |
|铅笔外壳| |√|
|铅笔芯|√| |
|书包| |√|
|钥匙|√| |
|玻璃杯| |√|
|----|----|----|
|石头| |√|
|书本| |√|
|塑料直尺| |√|
|金属直尺|√| |
|铅笔外壳| |√|
|铅笔芯|√| |
|书包| |√|
|钥匙|√| |
|玻璃杯| |√|
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