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【单选题】
下面对于同样转速和叶轮大小的离心泵和旋涡泵的比较,正确的是________。A.
离心泵扬程更高
B.
旋涡泵扬程更高
C.
旋涡泵流量更大
D.
无法比较
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【单选题】The traditional image of cave dwellers is probably ape-like creatures clad in skimpy animal skins, complete with clubs and matted hair and chewing unidentifiable bones. But in the region around Saumur...
A.
Traces of prehistoric cave dwellers.
B.
Caves inhabited since prehistoric times.
C.
People who dress in animal skins.
D.
People who choose to live in caves.
【多选题】习近平主席在全国人大闭幕会议上的讲话指出中国人民爱好和平。我们将高举（）的旗帜，始终不渝走和平发展道路。
A.
和平、发展；
B.
团结、创新；
C.
和平、务；
D.
合作、共赢；
【简答题】Last July, my 12-year-old car died on California's Santa Freeway. It was an hour before sunset, and I was 25 miles from home. I couldn't reach anyone to pick me up, so I decided to take a bus. Not kno...
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