外用药品标志的用意在于提醒消费者该类药品（）。
A、可以外用和口服
B、仅能口服
C、仅限于外用，不能口服
D、属于外科手术用药
参考答案：C
Prices of mobile phones _____ through a computer can be lower than prices in public market. [ ]
A. are bought
B. bought
C. been bought
D. buying
发电机典型故障有哪些？
