代数式a-2b表示：减2的差除以b．
故选C．
二进制数11101.1001对应的八进制数为（）
A．35.44
B．35.11
C．72.11
D．73.10
¾ Will you spare me a few minutes now?
¾ _______. But I’ll be free in half an hour.
A．Yes, of course
B．No. I can’t
C．Yes, with pleasure.
D．I’m afraid not
