|a﹣3|+|b﹣2|=0，则a+b=（ ）．
5．
It _____ me two and a half hours _____ my homework yesterday.[ ]
A. took; to do
B. takes; to do
C. spent; doing
D. cost; to do
CD－ROM光盘的外缘有5mm的范围因记录数据困难，一般不使用，故标准的播放时间为60分钟。请计算模式1情况下光盘存储容量是多少？
