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【简答题】
Identify whether the sentences are simple, complex or compound. 区分复合句,简单句,并列句。 I hope you are very well. I'm fine, but tired. Right now it is the summer vacation and I'm helping my Dad on the farm. August is the hottest month here. It is the time of year for the rice harvest, so every day I work from dawn until dark. Sometimes we go on working after dark by the lights of our tractors. We grow rice in the south of the States, but in the north where it is colder they grow wheat. We have a lot of machines on the farm. Although the farm is large, my Dad has only two men working for him. But he employs more men for the harvest. My brother takes care of the vegetable garden. It doesn't often rain in the summer here. As a result, we have to water the vegetable garden. Every evening we pump water from a well. It then runs along channels to different parts of the garden. Most Saturday evenings there is a party, even at harvest time. These parties often make us very happy. We cook meat on an open fire outside. It's great! Americans eat a lot of meat — too much in my opinion. Some of my friends drink beer. I don't, because I have to drive home after the party. In your letter you asked about the time in different areas of the States. There are five different time areas in the States. In my state we are fourteen hours behind Beijing time. How many different time areas do you have in China ? Well, I must stop and get some sleep. Please give my best regards to your parents. 答题方式例举: I hope you are very well (复合句) . I'm fine, but tired (简单句) ...... ..
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【简答题】裂化反应是_____________反应,而再生反应是___________反应。
【判断题】催化裂化反应是强吸热反应,而再生反应是强放热反应。
A.
正确
B.
错误
【判断题】电路分析中的一个电流得负值,说明它小于零。
A.
正确
B.
错误
【简答题】裂化反应是____反应,而再生反应是____反应。(填“吸热”或“放热”)
【判断题】电路分析中一个电流得负值,说明它小于零
A.
正确
B.
错误
【简答题】研究现代流化催化裂化( FCC )工艺流程( ppt 第 27 页),回答下面的问题。 ( 1 )目前催化裂化主要采用哪一类催化剂?催化剂的形状是怎样的?颗粒大小是多少?(15分) (2)裂解反应采用的是什么类型的反应器,反应时间大致是多少?(10分) ( 3 )在裂解反应器中,包含哪些 “ 相 ” ?(10分) ( 4 )裂解器中旋风分离器的作用是什么?(10分) ( 5 )催化剂失活的原因是什...
【单选题】以下关于学名的说法错误的是哪项?
A.
学名由属名+种加词+命名人构成
B.
属名和种加词需要斜体
C.
属名、种加词和命名人第一个字母需要大写
D.
属名和种加词之间以及种加词和命名人之间都要空一个字符
【单选题】石油油品催化裂化常采用流化床催化裂化反应器,其最大的优越性是
A.
流化床规模生产能力大
B.
反应在气态条件下进行,催化剂可以流化
C.
催化剂颗粒小,流化床流体阻力小
D.
在裂化过程中催化剂易失活,需要再生,而流化床可使反应与再生同时连续进行
【单选题】某一镜头组由以下三个镜头组成:(1)全景:足球场上,一群学生在踢足球。(2)中景:一学生起脚射门,球向球门飞去。(3)近景:对方守门员飞身接球。上述这一镜头组采用的组接方式是( )。
A.
静接静
B.
动接动
C.
静接动
D.
动接静
【单选题】以下哪项的命名是错误的?
A.
手太阴心经
B.
足阳明胃经
C.
手少阳三焦经
D.
足太阳膀胱经
E.
足厥阴肝经
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