泵的轴承室油位为什么不能太高。
参考答案：（1）油散热差，油温易高（2）易冒出、损失、污染环境
This is the concert hall ________ he has given very successful performances.
A．where
B．which
C．that
D．when
历史上的汉高祖叫什么名字？
