題目列表(包括答案和解析)
一拋物線形拱橋,當水面離橋頂2m時,水面寬4m,若水面下降1m,則水面寬為( )
A.m B. 2m C.4.5m D.9m
一拋物線形拱橋,當水面離橋頂2m時,水面寬4m,若水面下降1m,則水面寬為( )
A.m B. 2m C.4.5m D.9m
一拋物線形拱橋,當水面離橋頂2m時,水面寬4m,若水面下降1m,則水面寬為( )
A.m B. 2m C.4.5m D.9m
一拋物線形拱橋,當水面離橋頂2m時,水面寬4m,若水面下降1m,則水面寬為( )
A.m B. 2m C.4.5m D.9m
A.m | B.2m | C.4.5m | D.9m |
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