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go up go by go down go over
we’re going to fly we’ll be flying we’ll fly we’re to fly
we're going to flying we'll be flying we'll fly we're to fly
B're=14.5 m，L're=174 m B're=14.0 m，L're=174 m B're=13.5 m，L're=174 m B're=13.0 m，L're=174 m
we’re going to fly we will be flying we will fly we’re to fly
B＇re=12.8m，L＇re=174.4m B＇re=13.8m，L＇re=184.4m B＇re=15.8m，L＇re=194.4m B＇re=16.8m，L＇re=204.4m
Because If Although Since
That’s my key. It’s over there It’s re D. There’s a book.
you’re convenient you’re at convenience it is convenient it is at convenience
Re=πρvLD/μ Re=ρvLD/μ Re=πvLD/μ Re=ρvLD/μ
He’s , His They’re ,Their She’s , Her Their , They’re
we’re going to fly we’ll be flying we’ll fly we’re to fly
雷诺数Re有关 相对粗糙ks/d有关 Re及ks/d有关 Re及管长l有关
Because If Although Since
Because If Although Since
we’re going to fly we’ll be flying we’ll fly we’re to fly
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