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英译汉When reports came into London Zoo that a wild puma had been spotted forty-five miles south of London, they were not taken seriously.

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英译汉You don’t love a women because she is beautiful, but she is beautiful because you love her.

一密度为7800kg/m3的小钢球在相对密度为1200kg/m3的某液体中的自由沉降速度为在20℃水中沉降速度的1/4000,如沉降区为层流,则此溶液的粘度为:

A. 4000mPa·s;
B. 40mPa·s;
C. 38.82Pa·s;
D. 3882mPa·s

含尘气体在降尘室内按斯托克斯定律进行沉降。理论上能完全除去30μm的粒子,现气体处理量增大1倍,则该降尘室理论上能完全除去的最小粒径为:

A. 60μm
B. 15μm
C. 30μm
D. 42.4μm

在降尘室中,与尘粒的沉降速度无关的是:

A. 颗粒的几何尺寸
B. 颗粒与流体的密度
C. 流体的水平流速;
D. 颗粒的形状

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