A:0.4和0.6
B:2.5和1.0
C:0.4和0.4
D:0.6和1.0
根据短文理解选择答案。
FILA Men's T-shirts
Made in: China
Colour: white
Size: M
Material: cotton
Wash them with warm water in machines (洗衣机).
Price: ¥320
FIRS Men's Coats
Colour: grey
Size: L
Material: 98% wool, 2% cotton
Dry cleaning (干洗) only.
Keep them in dry and cool places.
Price: ¥1320
Senda Women's Shoes
Colour: pink
Size: M (235 mm)
Material: leather
Keep away from water.
Price: ¥820
关于功率和机械效率,下列说法中正确的是 ( )