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【单选题】
序号10对应的房屋构造名称是( )A.
平台
B.
栏杆
C.
梯段
D.
扶手
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举一反三
【单选题】—Excuse me, sir. Could you help me? —Sure ?
A.
What is that
B.
What is it
C.
What help
D.
What do you want
【单选题】--Excuse me, what time is it now? --Let me see. It’s .
A.
half past ten
B.
three quarters
C.
one minute
D.
thirty
【单选题】People think that the pure scientist usually disregards the application of pure science to practical affairs, ______ his attention to explanation of how and why events occur.
A.
refining
B.
defining
C.
confining
D.
declining
【单选题】Pure science, leading to the construction of a microscope ______.
A.
is not always as pure as we suppose
B.
necessarily results from applied science and the discovery of a cell
C.
may lead to antiscientific, 'impure' results
D.
necessarily precedes applied science, leading to the discovery of the cell
【单选题】Pure science, leading to the construction of a microscope ______.
A.
is not always as pure as we suppose
B.
may lead to anti-scientific 'impure' results
C.
necessarily results from applied science and the discovery of a cell
D.
necessarily precedes applied science, leading to the discovery of the cell
【单选题】已知化学反应2C(s)+O 2 (g)=2CO(g)，2CO(g)+ O 2 (g)=2CO 2 (g)都是放热反应。下列说法不正确的是 [ ]
A.
12gC(s)所具有的能量一定高于28gCO(g)所具有的能量
B.
56gCO(g)和32gO 2 (g)所具有的总能量大于88gCO 2 (g)所具有的总能量
C.
12gC(s)和32gO 2 (g)所具有的总能量大于44gCO 2 所具有的总能量
D.
将一定质量的碳燃烧，生成CO 2 比生成CO时放出的热量多
【简答题】蒸汽的初压越高,朗肯循环的热效率越( ),乏汽的干度越( )。
【单选题】已知：C(s)＋O 2 (g)＝CO 2 (g) △H 1 CO 2 (g)＋C(s)＝2CO(g) △H 2 2CO(g)＋O 2 (g)＝2CO 2 (g) △H 3 4Fe(s)＋3O 3 (g)＝2Fe 2 O 3 (s) △H 4 3 CO(g)＋Fe 2 O 3 (s)＝3CO 2 (g)＋2Fe(s) △H 5 下列关于上述反应焓变的判断正确的是
A.
△H 1 ＞0，△H 3 ＜0
B.
△H 2 ＞0，△H 4 ＞0
C.
△H 1 ＝△H 2 ＋△H 3
D.
△H 3 ＝△H 4 ＋△H 5
【多选题】关于蒸汽，以下说法错误的是（）。
A.
蒸汽的初压力和终压力不变时，提高蒸汽初温能提高朗肯循环热效率
B.
蒸汽初压和初温不变时，提高排汽压力可提高朗肯循环的热效率
C.
降低排汽压力可以使汽轮机相对内效率提高
D.
蒸汽与金属间的传热量越大，金属部件内部引起的温差就越小
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