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【单选题】
Sh(S) 型泵的叶轮是对称布置的,水从叶轮两侧流入,所以( )相互抵消了
A.
轴向推力
B.
径向推力
C.
跳动
D.
振动
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【单选题】Now our biggest summertime question has been answered: Why do people look so much better in sunglasses Vanessa Brown, a senior lecturer of art and design at Nottingham Trent University, gave an inside...
A.
introduce the major functions of sunglasses
B.
describe the evolution of sunglasses
C.
explain why sunglasses improve appearance
D.
demonstrate how to make better use of sunglasses
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【单选题】Now our biggest summertime question has been answered: Why do people look so much better in sunglasses Vanessa Brown, a senior lecturer of art and design at Nottingham Trent University, gave an inside...
A.
introduce the major functions of sunglasses
B.
describe the evolution of sunglasses
C.
explain why sunglasses improve appearance
D.
demonstrate how to make better use of sunglasses
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