20kWh是多少MJ？
20kWh = 72MJ
是72MJ，所以说成72MJ也没问题——四舍五入的误差在0.5%以内。
反过来，20MJ是多少kWh？
20MJ = 5.56kWh
计算公式: MJ = kWh × 3.6
该数值前后的 kWh → MJ
2 kWh7.2MJ
4 kWh14.4MJ
6 kWh21.6MJ
8 kWh28.8MJ
10 kWh36MJ
12 kWh43.2MJ
14 kWh50.4MJ
16 kWh57.6MJ
18 kWh64.8MJ
20 kWh72MJ
22 kWh79.2MJ
24 kWh86.4MJ
26 kWh93.6MJ
28 kWh100.8MJ
30 kWh108MJ
32 kWh115.2MJ
34 kWh122.4MJ
36 kWh129.6MJ
38 kWh136.8MJ
40 kWh144MJ