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【单选题】
发动机产生爆震的主要原因是()A.
点火提前角过大
B.
发动机温度过高
C.
燃烧室过度积碳
D.
以上都是
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【单选题】---What are you going to do this weekend? -----I’m going to help _____the city parks with my classmates to make them clean.
A.
set up
B.
fix up
C.
put up
D.
clean up
【单选题】What is the possible relationship between the speakers?
A.
Family members
B.
Classmates.
C.
Co-workers.
【简答题】suppose your class is to hold a charity sale for kids in need of help. write your classmates an email to 1) inform. them about the details and 2)encourage them to participate 100 words use LiMing.Don&...
【单选题】On the one hand, he was highly praised by his teachers, but blamed by some of his classmates______.
A.
on another hand
B.
at other hand
C.
at second hand
D.
on the other hand
【简答题】( )是痤疮发展过程中的关键因素。
【简答题】The new student is quite reserved. Never __________ him talking with his classmates． [A] did I find [B] I found [C] have I found [D] I have found
【单选题】Our victory in the school sports meet resulted from the collective__________of all the classmat
A.
289. Our victory in the school sports meet resulted from the collective__________of all the classmates. A．wisdom
B.
wisdoms
C.
brightness
D.
cleverness
【简答题】一台笼型三相异步电动机，定子绕组Y形联结，其技术数据为：额定功率P N =40kW，额定线电压U 1N =380V，额定电流I N =87.2A，起动电流倍数K T =6.3，起动转矩倍数K st =1.2。要求该电动机起动时最大电流不超过350A，现有一台三相对称电抗器，每相电抗为X=0.3Ω。如果用该电动机拖动通风机工作，试问能否采用定子串接该电抗器减压起动?
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