题目:
在离心泵组成部件中,()上制有放气螺孔和放水螺孔。
A.托架
B.叶轮
C.泵壳
D.底座
答案:
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It’s universally accepted that we all may have to face failure many times. For example, as senior students, we may suffer failures in exams. Discouraging as failure are,...