已选分类
工学林业工程
单选题深虫眼是指昆虫蛀蚀原木的深度自( )以上的虫眼。 A．1mm B．10mm C．3mm D．30mm
单选题Generally, machine utilization rate should be ______ machine mechanical availability. A. less than or equal to B. greater than or equal to C. always equal to
单选题对原木材色、光泽、纹理进行检验时，主要使用( )检验方法。 A．视觉 B．听觉 C．嗅觉 D．触觉
单选题The major forest products include ______. A. full tree、 long log、 short log, chip B. full tree、 round log、 short log, chip C. whole tree、 long log、 short log, sawtimber
单选题If the timber has been purchased on a lump-sum basis, inattention to bucking decisions can create large financial losses to ______. When timber has been purchased on a (per unit of volume) harvested basis, the losses associated with miss cut logs are borne by the ______. A. timber buyer, landowner B. landowner, timber buyer C. forest manager, logger
单选题According to the way the machine operated, the felling machine can be classified into ______. A. three-wheel machine vs. four-wheel machine B. drive to tree machine vs. swing to tree machine C. saw-head machine vs. shear-head machine
单选题椴木树种管孔分布的特征为( )。 A．散孔材 B．半散孔材 C．环孔材 D．半环孔材
单选题深虫眼是指昆虫蛀蚀圆材的深度自( )以上的虫眼。 A．1mm B．10mm C．3mm D．3cm
单选题When timber has been purchased on a (per unit of volume) harvested basis, the losses associated with miss cut logs are borne by the ______. If the timber has been purchased on a lump-sum basis, inattention to bucking decisions can create large financial losses to A. landowner, timber buyer B. timber buyer, landowner C. forest manager, logger
单选题The major forest products include ______. A. full tree. long log. short log, chip B. full tree. round log. short log, chip C. whole tree. long log. short log, sawtimber
问答题一根锯切用原木，树种为落叶松，材长4.17m，小头短径35.9cm，长径38.4cm。靠小头检尺长终止线上有一活节，尺寸为9.6cm，靠大头有一死节，尺寸为7.8cm。检尺长范围内节子最多1m内有活节三个，死节两个，尺寸分别为5.8cm、3.6cm、2.9cm、6.5cm、2.5cm。没有其他缺陷，求此材检尺尺寸、缺陷百分率和1m内节子个数。
问答题影响木材力学性质的因素有哪些，它们对木材的力学性质有何影响。
问答题Please make a detailed companson of CTL vs. Tree-Iength methods.
问答题木材做为一种室内装修装饰材料具有其特殊的效果，谈谈你对木材这种效果的认识。
问答题Please make a detailed comparison of cut-to-length vs tree length method.
问答题Please describe and discuss the timber harvests in depth including the categories and their respective target, purpose, and criteria.
问答题有一根双桠材，一根干岔的长度为4.18m，短径30.6cm，长径34.1cm；另一根干岔的长度为3.96m，短径27.5cm，长径30cm，求此原木的检尺长和检尺径。
判断题木材具有一定的导电能力主要是因为在木材中具有一定的自由离子。( )
判断题红松、落叶松、云杉、臭松，这些树种中都有正常的树脂道。( )
判断题在树木直径生长过程中，生成的木质部的量要小于韧皮部。( )