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【单选题】
总流能量方程 用于压缩性可忽略的气体时,下述论述中正确者为( )
A.
p 1 及p 2 分别为第一断面及第二断面的相对压强
B.
p 1 及p 2 分别为第一及第二断面的绝对压强
C.
p 1 及p 2 用相应断面的相对压强或绝对压强,不影响计算结果
D.
上述方程只适用于液体,不适用于气体
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举一反三
【单选题】A _____________ process essay tells the reader how to do or make something.
A.
directional
B.
informational
C.
informative
【单选题】Born in the crisis of the old regime and Iberian Colonialism, many of the leaders of independence share the ideas of representative government, careers open to talent, freedom of commerce and trade, t...
A.
并列结构
B.
分裂结构
C.
同位语结构
D.
否定结构
【简答题】选词填空 ( 注意有些需要变换形式 ) : hooked, mold, litany, resonate, pulse, sage, heed, tangible, certified, pick up She remained in the doorway, listening to his ______of complaints against her . The tension ...
【单选题】Born in the crisis of the old regime and Iberian Colonialism, many of the leaders of independence share the ideas of representative government, careers open to talent, freedom of commerce and trade, t...
A.
并列结构
B.
分裂结构
C.
同位语结构
D.
否定结构
【单选题】Many of the leaders have become on power and money.
A.
roost
B.
hooked
C.
shook
D.
Took
【简答题】把以下句子翻译成汉语,注意单词 money 的翻译方法。 1.I spent lots of money on smart new outfits for work. 2.She'd do anything for a bit of pin money. 3.Many of the leaders have become hooked on power and money.
【判断题】A directionalprocess essay tells the reader how to do or make something.
A.
正确
B.
错误
【判断题】网络购物建立在物流配送的基础上,核心是电子商务。
A.
正确
B.
错误
【判断题】用定距尺度和定比尺度测量获得的结果被称为参数变量。
A.
正确
B.
错误
【简答题】设a<0,b>0,不等式a< 1 x <b的解集为(  ) A.( 1 a ,0)∪(0, 1 b ) B.(- 1 b ,- 1 a ) C.(- 1 b ,0)∪(0,- 1 a ) D.(-∞, 1 a )∪( 1 b ,+∞)
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