[{"data":1,"prerenderedAt":61},["ShallowReactive",2],{"q-105170-arch_construction-39":3},{"question":4,"neighbors":26,"sameNumber":45,"prev":34,"next":37},{"id":5,"classKey":6,"session":7,"year":8,"subject":9,"number":10,"groupStem":11,"ownStem":12,"stem":12,"options":13,"answer":17,"answerKind":19,"answerS":11,"answerNote":11,"images":20,"explanation":22,"withheld":11,"deepChars":23,"freq":24,"indexable":25},"arch-105170-801-0103-039","architect","105170",105,"建築構造與施工",39,null,"景觀整地時，樹木常需斷根。斷根溝作法，下列何者正確？",{"A":14,"B":15,"C":14,"D":16},"挖掘溝槽","木板擋土樹木根系樹木根系 30~45 cm 45~60 cm 碎石透水層切勿回填 7.5 cm± 15 cm±","挖掘溝槽樹木根系樹木根系 45~60 cm 45~60 cm 回填土壤碎石透水層 7.5 cm± 15 cm±",[18],"C","single",[21],"\u002Fimages\u002Farch-105170-801-0103-039.png","本題考點：景觀整地或大樹移植前的「斷根」作業，斷根溝的開挖斷面與溝內回填材料，必須配合切口長出新細根的需求。\n【正解理由】斷根的目的，是在樹木還留在原地時，先把伸向外圍的側根切斷，讓切口附近萌發大量細根，日後挖起的根球內才有足夠吸收水分與養分的細根。要讓切口長出新根，有兩個要件：第一，切口要被濕潤的介質包覆，不能長時間暴露在空氣中乾枯；第二，切口周圍要有細根能伸入、能保水保肥的土壤。依題圖，(C) 開挖寬約 7.5 cm、深 45~60 cm 的溝槽，切斷根系後隨即以「回填土壤」填滿溝槽，切口被土壤包住、保持濕潤，新根可以直接長進回填土中，兩個要件同時滿足。故選 C。\n【逐項排除】\n(A) 錯誤。圖示溝內填的是「碎石透水層」，碎石顆粒大、孔隙多，切口周圍大部分是空氣，保水差，切口容易乾枯，細根也難在碎石間伸展，不符合「切口被土壤包覆」的要件；另外圖中溝深標示為 30~45 cm，比 (C) 淺，較深處的側根較可能留在溝底以下而沒被切到。改成以土壤回填、溝深涵蓋主要側根分布範圍，才與 (C) 相同。\n(B) 錯誤。圖示以「木板擋土」撐住溝壁，並註明「切勿回填」，溝槽保持開放、溝寬約 15 cm。切斷的根端直接暴露在空氣與日曬中，會迅速失水壞死，而且溝內沒有任何介質讓新根伸入，斷根就失去「養出細根」的意義。斷根溝是切根後回填土壤的溝，不是需要擋土留空的開挖面；改成切根後立即回填土壤才對。\n(C) 正確。溝深 45~60 cm、寬約 7.5 cm，切根後以土壤回填，切口受土壤包覆保濕，新生細根可直接在回填土中生長。\n(D) 錯誤。溝深 45~60 cm 與 (C) 相同，但溝內填的是「碎石透水層」，問題與 (A) 一樣：碎石保水差、切口周圍多為孔隙，新根缺乏可伸入的土壤介質。碎石透水層的功能是排水，用在斷根溝裡反而讓切口變乾。改成以土壤回填，才符合斷根溝的作法。\n【記憶點】斷根溝的關鍵在「切完就用土壤填回去」：留空會乾、填碎石也會乾，只有土壤能讓切口長出新根。",625,1,true,[27,30,33,36,39,42],{"number":28,"session":7,"stem":29},36,"下列那一個工程項目一般歸屬於假設工程？",{"number":31,"session":7,"stem":32},37,"有關電梯的敘述，下列何者錯誤？",{"number":34,"session":7,"stem":35},38,"有關天花板之規劃與施工，下列敘述何者較不適當？",{"number":37,"session":7,"stem":38},40,"現場的施工圖（shop drawing）應由何單位準備？",{"number":40,"session":7,"stem":41},41,"下列敘述有關建築物設有固定座椅席位者，其輪椅觀眾席位數量，何者錯誤？",{"number":43,"session":7,"stem":44},42,"建築工程地下室採用逆打工法，最主要目的為何？",[46,49,52,55,58],{"number":10,"session":47,"stem":48},"114180","有關仿石質複層塗料之施工方式，下列何者錯誤？",{"number":10,"session":50,"stem":51},"113190","混凝土坍度過低不適於澆置時，下列何者錯誤？",{"number":10,"session":53,"stem":54},"112190","有關室內裝修工程的敘述，下列何者錯誤？",{"number":10,"session":56,"stem":57},"111180","下列何種帷幕外牆系統，最常搭配鷹架系統施工？",{"number":10,"session":59,"stem":60},"110180","以鋼構造柱梁系統為例，何者不是增加水平勁度（抗風或抗震）的有效方式？",1791863214642]