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 ?????ֵ????ż????ܶ???1.4-2.2g/cm3??,?ȸֲ???4-5????ǿ?ȸ??ڸֲģ?????Ա?ǿ??(??λ?ܶȵ?ǿ??)??????,?????˳??õ??????????Ͻ?֡????Ͻ??Լ??Ѹֵȡ???ˣ??ڷɻ?????????????Լ?????ɴ?????е???????ڶ?IJ?Ʒ?????????еõ??˷dz??õ?Ӧ??Ч???????磺?ɻ??Ļ????????塢??????β׶??????Ŀ??壻?????Ŀ??壻????ɴ??Ŀ??????????????ʹ?ò????ֲ??϶???????ǿ?ȣ??????????أ??Ӷ???ʡȼ?ϡ?????ٶȡ?  ?Ļ????????塢??????β׶??????Ŀ??壻?????Ŀ??壻????ɴ??Ŀ??????????????ʹ?ã???????һֱ?ܵ???Щ??ҵ??????.
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