叶片泵转子的叶片槽，因叶片在槽内往复运动，磨损较快且叶片也经磨损后，间隙()。
A、增大
B、减小
C、不定
D、大小不定
参考答案：A
用stress/pressure的适当形式填空
1: More and more people cannot bear the _____ of modern life.
2: The patient is complaining of his feeling of _____ on his chest.
3: Nobody can work well under much _____.
4: Rob looks so _____ out since he started this new job.
夏天，冰块周围飘浮着“白气”，“白气”主要是由 （冰块/空气）中 （填物态名称）的“水” （填物态变化名称）形成的．
