I will tell you a secret, but you must promise it around.
A:not spread
B:not to spread
C:don't spread
D:to not spread
使用显微镜观察同一视野细胞时,看到的细胞数目最多的镜头组合是( )
①目镜5×②目镜15×③物镜10×④物镜40×