当需在外电架空线路保护区内施工或作业时，应在采取（）后进行。
A.防护措施
B.安全措施
C.安全隔离
D.验电措施
参考答案：B
The book which is ______ of being read a second time is ______ 15 dollars. [ ]
A. worthy ; worthy
B. worth ; worth
C. worthy ; worth
D. worthwhile ; worthy
资金集约
