全程监控，对物流关键信息的全程（），实现物流作业全程透明和有效管理。
A.数字化
B.可视化
C.跟踪化
D.记录化
参考答案：A, B
A large number of farmers _____ become workers or businessmen, so the number of farmers
that ____ working in the fields is decreasing.
A. have, is
B. has, are
C. have, are
D. has, is
危险源转化为风险过程有那些阶段？
