______指有较大的市场份额，但在经营态度上多采取保守战略的竞争者。
A．市场领导者
B．市场挑战者
C．市场跟随者
D．市场补缺者
参考答案：C
电动机超载会造成电机超温.
---I am going to Nanjing and stay there for a week.
---_________you are there, would you please buy some books for me?
A．If
B．While
C．Since
D．As soon as
