By micro-analysis on the aging fibers, it indicates that attack of alkali hydrates to vegetable fibers is serious and the flexibility becomes lower and the brittleness becomes increase for the calcium hydroxide crystal conglomerated in the fibers bosom.

通過對老化后纖維的微觀分析發(fā)現(xiàn)人人揉揉揉揉揉日日，水泥水化后的堿性物質(zhì)對天然植物纖維的侵蝕較大三级片小视频在线播放，Ca_2晶體在纖維內(nèi)腔中的沉積使纖維的柔性降低，脆性增加你懂网站在线观看，在長期干濕循環(huán)作用下三级视频网站视频网站受不了了，纖維水泥基材料的抗折強度下降北京一级黄片。

The chocolate implies a type of yellow alkali vegetable, this kind of material contributes to keeping a heart health and promotes blood circulation, keep blood vessel from jaming but cause a coronary or suffer a stroke.

巧克力含有類黃堿素，這種物質(zhì)有助于保持心臟健康色屋永久无域名无码视频网站、促進血液循環(huán)狼友视频无码，防止血管阻塞而導致冠心病或中風。