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【单选题】
对于达西定律中的流速,下列说法正确的是:A.
渗透速度是土体中某一点水流的真实流速
B.
渗透速度是土体孔隙中水流的平均流速
C.
渗透速度是平均到全断面面积的一种假想速度
D.
渗透速度比真实流速大
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】反映了响应y(t)的 和 随频率变化情况。
【单选题】In some places women are expected to earn money men work at home and raise their children.
A.
because
B.
but
C.
though
D.
while
【单选题】In some places in Yunnan, women are expected to run society and earn money ______ men work at home and raise their children.
A.
but
B.
while
C.
because
D.
though
【单选题】Which of the following places was NOT visited by the family? 查看材料
A.
Islamic complex.
B.
Historical buildings.
C.
Local-style. markets.
D.
Shopping mall boutiques.
【单选题】In some places, women earn money ________ men work at home and raise their children.
A.
and
B.
when
C.
while
D.
though
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