摘要：2． 古诗云“春蚕到死丝方尽.蜡炬成灰泪始干 .蜡烛在燃烧过程中.下面说法正确的是 ······················································································································ ( ) A．质量不变.体积不变.密度变大 B．质量变小.体积变小.密度不变 C．质量变小.体积不变.密度不变 D．质量.体积.密度都变小

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