下列有关合金性质的说法正确的是A．合金的熔点一般比它的成分金

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下列有关合金性质的说法正确的是

A．合金的熔点一般比它的成分金属高

B．合金的硬度一般比它的成分金属低

C．组成合金的元素种类相同，合金的性能就一定相同

D．合金与各成分金属相比，具有许多优良的物理、化学或机械性能

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