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【单选题】
以下关于煤的燃烧过程说法错误的是( )。
A.
煤是一种复杂的固体碳氢燃料,除了水分和矿物质等惰性杂质以外,主要成分是由碳、氢、氧、氮和硫这些元素的有机聚合物组成的
B.
煤的可燃质的结构主体是碳原子构成的六角形片状大分子,这些大分子的基本结构是一些聚合的环状结构,而环状结构则是以芳香环为主体,再加上脂环结构并可能有含氧、含氮和含硫的环状结构,在环状结构周围存在着各种脂肪侧链和官能团
C.
煤在受热时,煤颗粒表面和渗在缝隙里的水分蒸发出来,变成干燥的煤,同时逐渐使最易断裂的链状和环状的烷挥发出来成为气态挥发分
D.
若外界温度足够高,又有一定量的氧,那么挥发出来的气态烃就会首先达到着火条件而燃烧起来
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【判断题】The Brontë sisters were born in Thornton, West Yorkshire, England in the early 19th century.
A.
正确
B.
错误
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A.
If I were you, I'll eat less
B.
If I am you, I'd eat less
C.
If I were you, I'd eat less
D.
If you were me, I'd eat less
【单选题】If I were you I __________ plant some trees around the house.
A.
will
B.
would have
C.
would
D.
will have
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【简答题】听句子,选择最佳答语。 (     )1. A. If I were you, I'd take them some flowers. B. If I were you, I'd wear a T-shirt and jeans. C. If I were you, I'd visit the science museum. (     )2. A. I am afraid of tests. B...
【单选题】下列间隙中因局部麻醉而引起感染的不包括
A.
咬肌间隙
B.
颞下窝
C.
翼下颌间隙
D.
咽旁间隙
E.
口底间隙
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A.
正确
B.
错误
【单选题】听力原文:M: If I were you I wouldn't interrupt the boss while he's in an important meeting. Wait until he comes back to his office. W: He told me to bring him this information as soon as it arrives, even ...
A.
In another building.
B.
In his office.
C.
In the bathroom.
D.
In a meeting.
【单选题】If I were you,
A.
I will not play hockey.
B.
I would not play hockey.
C.
I would not have played hockey
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A.
will
B.
would
C.
may
D.
should
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