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反馈参考答案：
举一反三
【单选题】When do you start eating?
A.
As soon as you arrive at the lunch or dinner.
B.
As soon as everyone is served.
C.
When a speech is being made.
D.
When the host begins eating.
【单选题】气急加重,咳脓性痰。动脉血气分析:动脉血氧分压 55mmHg,动脉血二氧化碳分压 75mmHg。该患者病情发展已出现的症状是
A.
Ⅱ型呼吸衰竭
B.
Ⅰ型呼吸衰竭
C.
高碳酸血症
D.
低氧血症
【简答题】有一星形连接的三角对称负载，已知各相电阻6欧，电感25.5毫亨，现接在380伏线电压，频率为50周/秒三相电源上，求通过每相负载的电流和三相平均功率多少？
【简答题】已知星形连接对称三相电源的线电压 ,求各线电压和相电压,并画出相量图。
【单选题】Materials which is applicable to a system as a whole uses zeros in the _______ element(s) of the ASN.
A.
2nd
B.
3rd
C.
2nd & 3rd
D.
1st & 2nd
【单选题】Which of the following materials is a good insulator?
A.
steel
B.
aluminum
C.
glass
D.
copper
【判断题】In Western culture, you can start eating as soon as the food is served in front of you.
A.
正确
B.
错误
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