之后留下的是海绵状金属镍。
超级电容也有两块金属片，但其外面有海绵状的多空材料，即活性炭涂层。
Ultracapacitors also have two metal plates, but they are coated with a sponge-like, porous material known as activated carbon.
超级电容也有两块金属片，但其外面有海绵状的多空材料，即活性炭涂层。
Ultracapacitors also have two metal plates, but they are coated with a sponge-like, porous material known as activated carbon.
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