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【单选题】
按地下水的埋藏条件分为潜水和承压水；按地下水含水层性质分为孔隙水、裂隙水、岩溶水。岩溶发育必须具备的条件是______。A.
要有可溶岩层、岩层因具有裂隙而透水、水必须有侵蚀性、岩层中流动的
B.
要有可溶岩层、岩层因具有裂隙而透水、岩层中流动的
C.
岩层因具有裂隙而透水、水必须有侵蚀性、岩层中流动的
D.
要有可溶岩层、岩层因具有裂隙而透水、水必须有侵蚀性
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【单选题】—' much rain yesterday? —Yes, there was. [ ]
A.
There was
B.
Was there
C.
There were
D.
Were there
【单选题】______ a lot of traffic on the road at first. [ ]
A.
There are
B.
There is
C.
There were
D.
There was
【简答题】It is estimated that there are more than 8 million restaurants in the world today. So it might surprise you to learn that restaurants as we know have only existed for a few centuries.Before 1765, ther...
【简答题】球形硬便常见于
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