[{"data":1,"prerenderedAt":51},["ShallowReactive",2],{"q-110180-arch_construction-1":3},{"question":4,"neighbors":25,"sameNumber":35,"prev":11,"next":27},{"id":5,"classKey":6,"session":7,"year":8,"subject":9,"number":10,"groupStem":11,"ownStem":12,"stem":12,"options":13,"answer":18,"answerKind":20,"answerS":11,"answerNote":11,"images":21,"explanation":22,"withheld":11,"deepChars":23,"freq":10,"indexable":24},"arch-110180-801-0103-001","architect","110180",110,"建築構造與施工",1,null,"木材在纖維飽和點以下時，有關其各方向之膨脹率，下列排序何者正確？",{"A":14,"B":15,"C":16,"D":17},"纖維方向＞徑向＞弦向","徑向＞纖維方向＞弦向","弦向＞徑向＞纖維方向","徑向＞弦向＞纖維方向",[19],"C","single",[],"本題考點：木材在纖維飽和點以下乾縮濕脹的異向性，也就是弦向、徑向與纖維方向（縱向）三個方向膨脹率的大小排序。\n【正解理由】木材含水率高於纖維飽和點時，增減的是細胞腔內的自由水，尺寸幾乎不變；含水率降到纖維飽和點以下，增減的是細胞壁內的結合水，細胞壁本身膨脹或收縮，木材尺寸才開始明顯變化。細胞壁中主要承載的次生壁中層，其纖維素微纖絲排列方向幾乎與細胞長軸平行，吸濕時微纖絲之間的間距撐開，主要使細胞「變粗」而不是「變長」，所以纖維方向的膨脹率極小。橫斷面上，徑向有沿半徑排列的木質線（射線）組織束制，膨脹受到拘束；弦向則沒有這種束制，且晚材在弦向連續成帶，晚材細胞壁厚、含結合水多，會帶動整條弦向一起膨脹。因此三個方向的膨脹率為弦向最大、徑向次之、纖維方向最小。故選 C。\n【逐項排除】\n(A) 纖維方向＞徑向＞弦向：敘述錯誤。排序與實際完全相反：纖維方向因微纖絲近乎平行細胞長軸，膨脹率是三者中最小，而非最大；弦向才是最大，而非最小。正確應為弦向＞徑向＞纖維方向。\n(B) 徑向＞纖維方向＞弦向：敘述錯誤，錯在兩處。其一，纖維方向膨脹率最小，不可能大於弦向，也不可能排在中間；其二，徑向受木質線束制，膨脹率小於弦向，不會是最大。正確應為弦向＞徑向＞纖維方向。\n(C) 弦向＞徑向＞纖維方向：敘述正確。弦向無木質線束制且晚材連續，膨脹最大；徑向受木質線拘束，次之；纖維方向受微纖絲排列方向限制，極小。\n(D) 徑向＞弦向＞纖維方向：敘述錯誤。纖維方向排在最後是對的，但徑向與弦向的大小顛倒了：徑向因木質線束制而膨脹較小，弦向才是最大。正確應為弦向＞徑向＞纖維方向。\n【記憶點】木材乾縮濕脹「弦向最大、徑向次之、纖維方向最小」，而且只發生在纖維飽和點以下。",545,true,[26,29,32],{"number":27,"session":7,"stem":28},2,"有關 Low-E 玻璃，下列敘述何者錯誤？",{"number":30,"session":7,"stem":31},3,"在臺灣的建築物外牆設計上，下列何者方式可最有效提高隔熱性能？",{"number":33,"session":7,"stem":34},4,"下列何項不是新建建築物在選擇「屋頂防水」的材料及工法的主要考量因素？",[36,39,42,45,48],{"number":10,"session":37,"stem":38},"114180","依據下圖中之衝擊韌性試片結果圖，假設於相同溫度下，試由高至低順序排列出該試片衝擊韌性…",{"number":10,"session":40,"stem":41},"113190","下列有關鋼材一般力學性能特性之描述何者錯誤？",{"number":10,"session":43,"stem":44},"112190","木材作為結構材料時應注意木紋斜率（tan θ），為達到受彎木料的最佳應力，下列何者正…",{"number":10,"session":46,"stem":47},"111180","鋁門窗的表面處理，下列那一種最耐候？",{"number":10,"session":49,"stem":50},"109180","營建材料表面粗糙時，陽光照在上面有助於何種光學行為的產生？",1791863194445]