[問題] 國中電功率
請問 11題 c選項怎麼算?
http://i.imgur.com/wTEBeuO.jpg

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推
12/12 15:01, , 1F
12/12 15:01, 1F
推
12/12 16:20, , 2F
12/12 16:20, 2F
→
12/12 22:28, , 3F
12/12 22:28, 3F
→
12/12 22:29, , 4F
12/12 22:29, 4F
推
12/13 00:37, , 5F
12/13 00:37, 5F
→
12/13 01:23, , 6F
12/13 01:23, 6F
→
12/13 09:37, , 7F
12/13 09:37, 7F