题型:选择题 Many rivers ________. [ ]A. have became polluted B. have become polluted C. have been polluting D. have become polluting 查看答案
题型:单项选择题 配伍题 急性单核细胞白血病()A.中性粒细胞碱性磷酸酶染色积分增高B.过氧化酶染色强阳性反应C.糖原染色强阳性反应D.非特异性酯酶染色强阳性反应E.骨髓铁染色细胞内、外铁显著增多,易见环形铁粒幼细胞 查看答案