城乡居民家庭住宅小区内的公共场所照明、门卫应执行()电价。
A.商业
B.非居民照明
C.一般工商业
D.居民生活
参考答案:D
Mr Cook is a man with a strong will.After repeated________he finally succeeded in his experiment.[ ]
A.announcements
B.decisions
C.remarks
D.attempts
什么叫水平反向脱水和垂直脱水?