特殊高处作业宜设有与地面联系的信号或(),并由()负责。
参考答案:通信装置;专人
The book, which is a useful guide for today's young people, deals with many questions and problems that face them at school and at home as well as in society.
A.are faced
B.confront
C.in opposition
D.meet.
简述农村股份合作经济组织利润分配程序。