我国目前的经济统计对企业类型的划分标准统一。
参考答案：错
离心泵机械密封泄漏标准一般轻油不超（）、重油不超（）。
With a large amount of work _________,the chief couldn’t spare time for a holiday.
A．remained being done
B．remaining to do
C．remained to be done
D．remaining to be done
