液氯泵底部填料密封是一种迷宫密封,填料压得过紧会()
参考答案:烧坏填料并划伤轴
一袋盐重500克,两袋盐共重______克,也就是______千克.
—Where did you go last night?
—I to go to Li Lei’s birthday party.
A.asked
B.am asked
C.have been asked
D.was asked