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【简答题】
忽略对流动影响较小的相似准则，仅考虑对流动起主要作用的相似准则，这种相似称为部分相似，保证模型流动与实物流动部分相似的试验方法称为 。
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举一反三
【单选题】Some scientists think that it may take ______ years to make robots look like people, and do the same things as us. [ ]
A.
hundreds of
B.
two hundreds of
C.
two hundreds
D.
two hundred of
【单选题】Some scientists think that it may take ______ years to make robots look like people, and do the same things as us.
A.
hundreds of
B.
two hundreds of
C.
two hundreds
D.
hundreds
【单选题】Some scientists think that it may take ____ years to make robots walk.
A.
hundreds of
B.
two hundreds of
C.
two hundreds
【单选题】Some scientists think that it may take ________ years to make robots look like people. [ ]
A.
hundreds of
B.
two hundreds of
C.
two hundreds
D.
two hundred of
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