单项选择题

At a standard lumber mill, the first grading choice for hardwood is the ______.
 A.Factory Class  B.Veneer Class  C.Sawlog Class

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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
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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
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