滚动轴承的各空穴处应充满油脂，而（）只需充到2/3容量处，以免温升过高。
A.轴承盒
B.轴承室
C.油管
D.水管
参考答案：B
—— She will finish the project within three days!
—— ______! I could do it in three hours.
A．You are right
B．I’m stuck
C．Oh, come on
D．Don’t mention it
统计的三种含义及联系？
