关于瑞氏染色的叙述,正确的是
A. 最适pH是6.4~6.8
B. 染料仅由酸性伊红和碱性亚甲蓝组成
C. 瑞氏染色现用现配:
D. pH偏碱,细胞染色偏红
E. 化学的亲和作用是细胞着色的主要原因
血涂片染色后红细胞染成蓝绿色和白细胞核染成紫色,可在下述何种情况时出现A.缓冲液在血片上放置过久
A. 染色时间不够
B. 染色时间过长
C. 瑞氏染色结果偏碱
D. 瑞氏染色结果偏酸
Listen to a talk about an English learner's learning experience and fill in the blank in each sentence based on what you hear.Michal lives in Poland, and Polish is his (1)______ language.Michal started learning English by (2)______________the Beatles.Michal is delighted and feels(3)_______ when he listens to the Beatles because he (4)___________ a lot better.Besides listening to (5)__________, Michal also reads (6)______________books in English.Michal made a great breakthrough in learning the English language after successfully finishing (7)______ the first (8)______________.According to Michal, English learning brings him (9)__________ and (10)____________.
用计算机解决问题时,首先应该确定程序“做什么?”,然后再确定程序“如何做?”请问“做什么?”是属于用计算机解决问题的哪一个步骤?( )
A. 分析问题
B. 设计算法
C. 编写程序
D. 调试程序