时间价值和风险价值是一致的，时间越来，风险越大。
参考答案：错
电除尘器阳极振打第二电场固化时间安排为（）。
Mr Brown had lain ____ the ground ____ four hours before they finally found him. [ ]
A. on; for
B. at; in
C. on; after
D. in; during
