简述二进制的特点。
参考答案：
仅“0”，“1”两个数，逢二进一，计算机可直接识别。
I visited quite a few relations and felt _____ tired during the Spring Festival.[ ]
A. a bit of
B. a lot of
C. a bit
D. a few
A．主动重吸收B．被动重吸收C．两者皆是D．两者皆非
肾小管对水的重吸收是
