每个料仓应针对所存材料设标示牌，必注明材料（）等数据。
A.品名、日期、规格
B.品名、保质期、规格
C.品名、来源、规格
参考答案：C
若a>0，b>0，且函数f(x)＝4x3－ax2－2bx＋2在x＝1处有极值，则ab的最大值为________．
改错题。
1. They are woman doctors in this hospital. ( )
A B C D
2. That's my friends house. ( )
3. He works for an advertising agency for an account manager. ( )
4. I shake hands with strangers, and not with friends. ( )
5. I'd like a pen friend from Spain and Japan. ( )
