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【单选题】
平面流动具有流函数的条件是A.
理想流体
B.
无旋流动
C.
具有流速势
D.
满足连续性
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【简答题】We have in the past ________ that we have y not only of the land but of the sea... We have not. Life goes on there just as it did from the ________.
【简答题】市盈率(P/E)是指（ ）的比率。
【简答题】人体缺乏会导致坏血病的维生素是 ;人体缺乏会导致脚气病的维生素是 。
【简答题】市盈率(简称P/E)，是指（ ）。
【简答题】人体缺乏会导致坏血病的维生素是 ;人体缺乏会导致脚气病的维生素是 。
【简答题】人体缺乏会导致坏血病的维生素是 ;人体缺乏会导致脚气病的维生素是 。
【单选题】The main idea of the first part: 1 In 1953, on the heels of a discovery of a second coelacanth specimen in the Comoros Islands off Madagascar’s coast, J.L.B. Smith, the man who described the species, ...
A.
Man’s influence is as yet but a passing shadow.
B.
But unable to observe them alive in their deep sea home, we have understood very little about how they live, where they live and how they behave.
C.
But it is a drop in the vast ocean-sized bucket of amazing discoveries waiting to be made.
D.
Man is far from having control of the ocean. We know very little about it, and the discoveries we have made, though monumental, are but a drop in an ocean-sized bucket.
【单选题】城市工程管线道路标准横断面图的图纸比例通常采用1∶200,图纸内包括( )。
A.
道路断面的各组成部分,如机动车道、非机动车道、人行道、绿化分隔带、绿化带等
B.
规划确定的所有管线在建设规划中的位置
C.
道路横断面的所在地段及编号
D.
各种建筑设施和交通道路下的横断面编号
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