单项选择题

在Word文档中显示不可打印字符时，择时高的小点表示。

A.逗号
B.分号
C.空格
D.制表符

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单项选择题

In the calibration of Na2S2O3 solution, K2Cr2O7 is not used to titrate directly, but the indirect iodine content method is needed for the reason that ( )

A．There is no definite measurement of the reaction
B．There is no proper indicator
C．Reaction speed is too slow
D．K2Cr2O7 is not oxidizing enough

单项选择题

有颗粒与无颗粒白细胞的区别依据是
A、有无嗜天青颗粒；
B、核的形态；
C、有无特殊颗粒；
D、胞质的多少；