搜题
王老师:19139051760(拨打)
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第1题

Various substances differ widely in their magnetic （磁性的） characteristics.
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第2题

This place has plentiful material resources.
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第3题

There is a large amount of energy wasted due to friction （摩擦）
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第4题

The students are encouraged to do more listening, reading and writing by their teacher.
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