在连锁店半径（）公里范围内所有企业均为目标客户。
A.1
B.2
C.3
参考答案：C
Tom's pet is _____. It _____ three weeks ago. [ ]
A. in death; dies
B. dead; died
C. dead; has died
D. dying; died
故障频数分析的常用方法有（）
A、故障原因频数统计分析
B、故障频率分析
C、故障强度率分析
D、故障ABC分类分析
