29.立木樹高(tree height)為測計立木材積主要因子之一,我國森林調查所慣用之立木高度為何?(A)全高(total height,Ht)(B)樹冠高(crown height,Lc)(C)幹高(bole height,Hb)(D)伐根高(stump height,Hs)