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【单选题】
下列关于气体燃料的性质说法错误的是( )。A.
工程中使用的气体燃料都不是单一化学成分的气体燃料，而是多种单一气体燃料的混合气体，所以其物理化学工艺性质均与单一成分的气体燃料有很大的区别
B.
气态的液化石油气比空气轻，容易积聚在地面附近和地势低洼处，在使用时必须加以注意
C.
着火温度并不是可燃气体固有的物化常数，它与燃气的种类、在混合燃气中含量、混合气的均匀程度和压力有关，也与燃烧设备的构造、周围介质的热容量、有无催化作用及燃烧体系的散热条件有关
D.
可燃气体和空气的混合物遇明火而引起爆炸时的可燃气体含量(体积分数)范围称为爆炸极限
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【简答题】Have you ever had a day when everything seemed to go wrong, and nothing seemed to go right? Not too long ago I was having one of those 1 . I was discouraged, tired and sad. My focus ( 中心 ) was on me, ...
【单选题】听力原文：W: I'm so upset, George! I found out I didn't get the promotion I was hoping for. M: I simply can't believe it! I'm really sorry. ! know how much you were counting on it. And if anyone deserved i...
A.
The woman is upset because she didn't pass the examination.
B.
The woman doesn't hope for a promotion ....
C.
The man gets used to counting on the woman.
D.
The man thinks that the women should be promoted.
【单选题】I was really hoping to get in today or tomorrow in case I need some antibiotics .
A.
青霉素
B.
维生素
C.
抗生素
D.
干扰素
【单选题】关于缓冲区溢出描述错误的是
A.
缓冲区是用来暂时存放输入输出数据的内存
B.
只要把内存加大,就可以避免缓冲区溢出
C.
指输入输出数据超出了缓冲区的大小,占用缓冲区之外的内存空间
D.
利用缓冲区溢出攻击,可以破坏程序运行,系统重新启动
【简答题】阅读理解。 I was sleeping soundly last night when I was awakened by someone's groans (呻吟). I listened, and heard it was from Sam, a student from Africa. I really wanted to go on sleeping, as I had insomnia...
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