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【单选题】
已知某一反应A + B D C + D,其∆H < 0, ∆S < 0,那么
A.
正反应在低温下能自发
B.
逆反应不管温度高低都自发
C.
正反应不管温度高低都自发
D.
正反应在高温下才能自发
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举一反三
【判断题】The bow-wow theory is based on the fact that modern languages have some words with pronunciations which seem to echo natural souds.
A.
正确
B.
错误
【单选题】在RL串联交流电路中,电路的阻抗为|Z|,感抗为X L ,总有效电压为U,电阻电压为U R ,有功功率为P,无功功率为Q,下面表示功率因数的表达式中,正确的是______。
A.
.
B.
.
C.
.
D.
.
【简答题】RL串联电路中,既有耗能元件____,又有储能元件____,为了反映功率利用率,在工程上,将____功率与____功率的比值称做功率因数,用符号____表示。
【单选题】What can we learn about 'soap operas' from the passage?A. They are teenagers favori
A.
24. What can we learn about 'soap operas' from the passage? A. They are teenagers favorites,
B.
They are much more expensive.
C.
They are les8 attractive.
D.
They are cheaper and easier to make,
【简答题】a summary of the story 2. a detailed study of the beauty of the language form
【判断题】无意注意是一种消极注意,因此教师在教学中应阻止学生无意注意的出现。
A.
正确
B.
错误
【单选题】The words like “bow-wow”、“bang”、“tick-tuck”are _____ motivated.
A.
morphologically
B.
semantically
C.
etymologically
D.
phonetically
【判断题】The bow-wow theory is based on the fact that modern languages have some words with pronunciations which seem to echo natural sounds.
A.
正确
B.
错误
【判断题】无意注意是一种消极注意,因此,教师在教学中应阻止小学生无意注意的出现。( )
A.
正确
B.
错误
【单选题】如混凝土的强度等级为C30, 则下列哪项叙述正确
A.
抗压强度设计值 fc=30MPa
B.
抗压强度标准值 fck=30MPa
C.
立方体抗压强度标准值 fcuk=30MPa
D.
抗拉强度标准值 f tk=30MPa
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