下列选项中不需要停塔作业的是()。
A、更换洗管阀
B、更换一楼出碱阀
C、更换单塔联络阀
D、更换出碱调节阀
E、更换中和水泵进口阀
F、更换下段气调节阀
参考答案:A, D, F
Mr Smith ____ a book about China last year but I don't know whether he has finished it. [ ]
A. has written
B. wrote
C. had written
D. was writing
作为调节对象和监测货币政策效果的金融指标是()。
A.货币政策最终目标
B.货币政策工具
C.货币政策中介目标
D.货币政策操作目标