Umm 我猜你应该是理解错了,
Prefix form 是要在很像有: G, M, k,d,c,m (Symbol)的
Exp: 10kg , 6cm ....
Standard form 是要很像 : 5 x 103 gram(5 kilogram/kg ) 因为103 (standard form )= kilo (prefix)
理解完后我们去看题目
1a ) 8000 g
i ) Prefix form = 8 kg
ii ) standard form = 8 x 103 gram
以此类推
2a ) 0.000005m
i ) Prefix form = 5 μm (5 micrometers)
ii ) standard form = 5 x 10-6 m (meters)
3a ) 6000000K
i ) Prefix form = 6 MK (6 megakelvins)
ii ) standard form = 6 x 106 K (Kelvin)
4a ) 0.004 A
i ) Prefix form = 4 mA (4 milliamperes)
ii ) standard form = 4 x 10-3 A (Ampere)
5a ) 3000000000m
i ) Prefix form = 3 Gm (3 gigameters)
ii ) standard form = 3 x 109 m (meter)
6a ) 0.5m
i ) Prefix form = 5 dm (5 decimeters)
ii ) standard form = 5 x 10-1 m (meter)
7a ) 0.000000008A
i ) Prefix form = 8 nA (8 nanoamperes)
ii ) standard form = 8 x 10-9 A (Ampere)
8a ) 0.09 m
i ) Prefix form = 9 cm (9 centimeters)
ii ) standard form = 9 x 10-2 m (meter)
记住后面的单位不要倒转/写错, 先写 symbol 再写 单位
可以参考课本pg16