A.they are subsidized by the government
B.they are often given to unknown artists
C.they can also be given to members of the Academy-Institute
D.they influence how the National Endowment for the Arts makes its award decisions
第8题
密封环(摩擦片)的作用是()。 A防止泵体内的液体由高压区向低压区泄露。
A.防止水泵发生汽蚀。
B.减少叶轮与泵体的摩擦 。
C.增加水泵的输出功率。
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