79 下列何種基底樹脂材料,所造成的線性收縮(linear shrinkage)最大?(A)高耐衝擊性(high-impact)丙烯酸樹脂(acrylic resin)(B)乙烯(vinyl)丙烯酸樹脂(C)灌注型(pour-type)丙烯酸樹脂(D)快速熱聚合型(rapid heat-cured)丙烯酸樹脂