有两箱同种零件,第一箱内装50件,其中一等品10件;第二箱内装30件,其中一等品18件;现随机地从两箱中挑出一箱,再从这箱中随机地取出一件零件,则取出的零件是一
A <img src="https://www.beizhujiaoyu.com/uploads/202208/164845122776351.png" width="16" height="32" /> B <img src="https://www.beizhujiaoyu.com/uploads/202208/164845123181151.png" width="16" height="32" /> C <img src="https://www.beizhujiaoyu.com/uploads/202208/16484512377541.png" width="16" height="32" /> D <img src="https://www.beizhujiaoyu.com/uploads/202208/164845124254711.png" width="16" height="32" /><p>