已选分类
工学
单选题Timber harvesting is the end of ______ of a forest in terms of timber production, and also the start of ______. A. timber production, forest management B. next generation, growing cycle C. growing cycle, next generation
单选题下列为商品的是( )。 A．农民自己生产的粮食供自己食用 B．我们身上穿的衣服 C．授课 D．阳光
单选题红松树种的从早材到晚材的变化为( )。 A．急变 B．缓变 C．不变 D．以上都不对
单选题桦木树种为( )。 A．散孔材 B．半散孔材 C．环孔材 D．半环孔材
单选题Timber harvest can affect the hydrology of a site, especially the ______. A. turbidity, quality, and the timing of water within or from the watershed B. quantity, quality, and the timing of water within or from the watershed C. quantity, quality, and sediment
单选题Diameter at breast height is usually measured at ______ above ground level. A. 1.5m B. 1.4m C. 1.3m
单选题( )是商品标准的中心内容。 A．技术要求 B．试验方法 C．商品分类 D．检验规则
单选题兴安落叶松树种的树脂道( )。 A．大而少 B．小而少 C．大而多 D．大而少
单选题Low pressure tires have ______. potential for compaction than high pressure tires. A. higher B. lower C. similar
单选题According to the way of felling, there are two types of mechanized felling machines, they are ______. A. drive-to-tree machines and swing-to-tree machines. B. three-wheel machines and four-wheel machines. C. skidding machines and forwarding machines.
单选题对商品的外形、结构、颜色、表面疵点等质量特征进行检验时，主要使用( )检验方法。 A．视觉 B．听觉 C．嗅觉 D．触觉
单选题兴安落叶松树种的从早材到晚材的变化为( )。 A．急变 B．缓变 C．不变 D．以上都不对
单选题商品检验学研究的对象是( )。 A．商品使用价值的评价 B．商品使用价值 C．商品质量 D．质量管理
单选题商品标准的本质特征就是( )。 A．通用 B．简化 C．组合 D．统一
单选题边材腐朽是( )受木腐菌侵害所形成的边材部分的腐朽。 A．伐倒木 B．枯立木 C．病腐木 D．以上都对
单选题Which of the following skidding machine is the least expensive skidding machine to own and operate? ______ A. Grapple skidder B. Clam-bunk skidder C. Cable skidder
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 bome by the ______. A. timber buyer, landowner B. landowner, timber buyer C. forest manager, logger
单选题对商品的弹性、韧性、硬度、温度等质量特性进行检验时，主要使用( )检验方法。 A．视觉 B．听觉 C．嗅觉 D．触觉
单选题In the cut-to-length method, the harvesting chains machine stock consists of a ______ and a ______. A. Harvester, skidder B. Harvester, forwarder C. Feller-buncher, forwarder
单选题商品的实用性、寿命、安全性属于商品的( )。 A．内在质量 B．社会质量 C．外在质量 D．经济质量