【单选题】泵密封件的作用是阻止转动件、泵轴、叶轮和静止件()的间隙处不发生液体向外漏失和直接磨损。
【单选题】Sir Gawain and Green Knight was created by
【单选题】Which of the following is a romance?
B.
Sir Gawain and the Green Knight.
【简答题】Sir Gawain and the Green Knight is _____ in style.
【多选题】起密封作用的零部件叫密封件,它分别是()
【判断题】密封件的作用是阻止介质泄漏和防止污物侵入。
【简答题】密封的功能是防止(),起密封作用的零件称为密封件。
【简答题】密封的功能是防止(),起密封作用的零件称为密封件。
【单选题】______ is about King Arthur and his round table knights.
B.
Sir Gawain and the Green Knight
C.
The Robin Hood Ballads