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【单选题】
已知水流的沿程水力摩擦系数 只与边界粗糙度有关,可判断该水流属( )A.
层流区
B.
紊流光滑区
C.
紊流过渡粗糙区
D.
紊流粗糙区
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举一反三
【简答题】The
ice ________ when the sun shone on
it.
【单选题】??Nazca was discovered in 1926 when______??
A.
the light shone on the lines
B.
three explorers viewed the lines from above
C.
the lines were not hidden by cjoud
D.
the lines followed the rays of the sun
【简答题】The day was warm and the sun shone down like a new beginning on my life. I was waving goodbye to my son, the last one of my fledglings （刚会飞的鸟）to leave home and go to new woods, 'University actually' ....
【简答题】(verb) to become liquid through heating The ice____when the hot sun shone on it.
【单选题】Nazca was discovered in 1926 when______.
A.
the light shone on the lines
B.
three explorers viewed the lines from above
C.
the lines were not hidden by cloud
D.
the lines followed the rays of the sun
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