题型:判断题 The schoolboys and schoolgirls are walking along the street, _____a small redcap .A.each of them has B.they each have C.every wears D.each wearing 查看答案
题型:判断题 染色体的固定液多含醋酸,醋酸可清楚地显示细胞核,但醋酸固定的缺点是()A.单独应用组织收缩明显B.不能有效地防止自溶C.醋酸穿透力太弱D.组织膨胀明显,尤其对于胶原纤维和纤维蛋白E.不能有效地抑制细菌生长 查看答案