November 2020 1 72 Report
1.mengapa tukang kayu merancang ukuran bingkai jendela sedikit lebih besar daripada ukuran sebenarnya?

2.mengapa sambungan antara dua jembatan beton terdapat celah diantaranya?

3.mengapa sambungan rel kereta api dibuat celah diantara dua batang rel tersebut? ​
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