The exceptional purity of the n-heptane distilled from Jeffrey Pine resin, unmixed with other isomers of heptane , led to its being used as the defining zero point on the octane rating scale of petrol quality.

還含有溶解在萜烯中的不揮發(fā)的黏性固體欧美激情亚洲3区，所以當樹脂暴露在空氣中在线视频日韩欧美，萜烯類物質(zhì)揮發(fā)掉，使得樹脂黏度增大www。色色色。com，形成固體人人爽人人爽人人A片。

Jeffrey's pine;Bull pine：黑材松

島松 Philippine pine;Luzon pine | 黑材松 Jeffrey's pine;Bull pine | 卡西亞松 Khasya pine;northern Burma pine;Langbian three-1eaved