商店的阿姨每天早上8时上班，下午5时下班，工作______小时．
5时+12时=17时
17-8=9（小时）．
答：妈妈一天工作9小时．
故答案为：9．
翻译句子,注意approach在句中的意思。
1. John is approaching retirement.
2. All the approaches to the palace were guarded by troops.
3. I don't think refusing to negotiate is the right way to approach this problem.
4. I find him difficult to approach.
在微型机汉字系统中，一个汉字的机内码点的字节数为（）
A.1
B.2
C.4
D.8
