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【简答题】
HAC方法中, ____ ___计算样本间的最短距离,即最大相似度; ____ ____计算样本间的最长距离,即最小相似度。
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【判断题】静物色彩过分的对比,容易使画面花而乱,难以形成统一的色调气氛。
A.
正确
B.
错误
【单选题】-Has Tommy finished his homework yet? -I have no idea; he ____ it this morning.
A.
was doing
B.
had been doing
C.
has done
D.
did
【简答题】充电设施既可以安装于( ),也可以安装在( )
【单选题】招标文件的发放:自招标文件出售之日起至停止出售之日止,最短不得少于( )个工作日。
A.
3
B.
5
C.
7
D.
10
【简答题】(1)由硫酸钾、硫酸铝和硫酸组成的混合溶液中,c(H + )=0.1 mol?L -1 ,c(Al 3+ )=0.4 mol?L -1 ,c(SO 2-4 )=0.8 mol?L -1 ,则c(K + )为______ (2)标准状况下,将33.6L的NH 3 溶解于水配成2L的溶液,则溶液的物质的量浓度为______mol/L (3)标准状况下,若aL NH 3 中含有的氢原子数为b,则阿伏加德...
【单选题】--- Tommy has just won the first prize in the oral English competition. --- ______ he was so excited this afternoon.
A.
No wonder
B.
It is happy that
C.
It is clear that
D.
No strange
【简答题】The work ______ early next morning. A) has to be finished                   B) has to finish C) will finish                          D) is finished
【简答题】Tommy is looking for ______ in the cinema. He has drunk too much water . A              B             C              D
【简答题】(1)含0.4mol Al 3+ 的Al 2 (SO 4 ) 3 中所含的SO 4 2- 的物质的量是______. (2)已知16g A和20g B恰好完全反应生成0.04mol C和31.76g D,则C的摩尔质量为______. (3)如果a g某气体中含有的分子数为b,则c g该气体在标准状况下的体积是(阿伏加德罗常数用N A 表示)______.
【单选题】— Have you seen Tommy, Rose? — No, I think he ________ America. [     ]
A.
has been to
B.
has gone to
C.
has been in
D.
went to
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