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【单选题】
圆管流动过流断面上的切应力分布为:A.
在断面上是常数
B.
是零,且与半径成正比
C.
为零,轴线性增大
D.
抛物线分布
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举一反三
【单选题】列宁在哪一篇文章中明确提出苏维埃报刊应该实现工作重心的转移,成为社会主义建设工具的?
A.
《党的组织与党的出版物》
B.
《怎样保证立宪会议的成功》
C.
《生产宣传提纲》
D.
《苏维埃政权的当前任务》
【单选题】How old was Thomas Jefferson when he became Governor of Virginia?
A.
He was 26.
B.
He was in his forties.
C.
He was 36.
D.
We don't know.
【简答题】Christopher Reeve was born in September, 1952. He was in his first school play when he was eight and he started 小题1: (act) in TV shows and films while he was still in college. He made many successful ...
【单选题】How old was he when he began to suffer from diabetes?
A.
He was in his puberty.
B.
He was in his childhood.
C.
He was in his middle age.
D.
He was in his sixties.
【单选题】某液体在内径为d l 的管路中稳定流动,其平均流速为u 1 ,当它以相同的体积流量通过内在为d 2 (d 2 =d 1 /2)的管路时,则其平均流速为原来的（ ）
A.
2倍
B.
4倍
C.
16倍
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