脊髓灰质炎疫苗接种的途径是
A. 皮内注射
B. 皮下注射
C. 肌内注射
D. 口服
E. 静脉推注
Which description is not right for blast cell? ( )
A. Big Cell size
B. Fine Chromatin
C. Predominant Nucleoli
D. Abundant Cytoplasm Cytochemical cell differentiation
POX stain is very useful to distinguish( ).
ALL and AML
B. ALL and CLL
C. AML and CML
D. AA and IDA
在双缝干涉实验中,设缝是水平的.若双缝所在的平板稍微向上平移,其它条件不变,则屏上的干涉条纹 [ ]
A. 向下平移,间距不变;
B. 向上平移,间距不变;
C. 不移动,但间距改变;
D. 向上平移,间距改变.