差别化战略包括：（）。
A.竞争差别化
B.产品差别化
C.服务差别化
D.渠道差别化
E.形象差别化
参考答案：B, C, D, E
热流计试验装置在热流计的长期和短期稳定性证明优于（）时，标定的时间间隔可选择在15d～30d。
A、±0.5%
B、±1%
C、±1.5%
D、±2%
An investor has the following choices available: She can buy a 10 percent semi annual coupon, 10-year bond for $1000. She can reinvest the coupons at 12 percent. She can sell the bond in three years at an estimated price of $ 1050. Based on this information, the average annual rate of return over the three years is:
A．
B．
C．
