下列说法错误的是[ ]
A．任何有理数都有倒数
B．互为倒数的两数的积等于1
C．互为倒数的两数符号相同
D．1和其本身互为倒数
答案：A
_____ the government recovers the vehicle purchase tax and the oil prices go up continuously, the sales of the vehicle in China are still increasing every year.
A．When
B．Once
C．Since
D．While
监察机关在什么情形下，可以提请税务、海关、工商行政管理、质量监督、检验检疫等机关予以协助？
