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【简答题】
心理测验工作应遵守的原则为（ ）。
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举一反三
【简答题】As a boy ,Mark Twain caused much trouble for his parents . He used to play practical jokes on all his friends and neighbors .The nature of his jokes often led to violence. He hated to go to school, an...
【单选题】主令电器的作用是（ ）
A.
用于控制、线路保护或信号转换
B.
切换控制电路，命令电动机及其他控制对象的起动、停止或工作状态的变换
C.
当电路发生短路或严重过载时，切断电路，起到保护作用
D.
用于频繁的切断主电路
【简答题】根据听到的内容作答____. A) Take a job to pay the tuition fees. B) Visit his parents in his hometown. C) Spend the summer with his friends. D) Work as a volunteer in South Africa.
【简答题】主令电器的作用是什么,常用的主令电器有哪些?
【简答题】Bill was a boy of 15. His parents went to gambling() day and night. Nobody cared about hi. He always failed in his exams. So his teachers didn’t like him, nor did his classmates play with him. Bill ...
【单选题】主令电器的作用是（ ）
A.
用于控制、线路保护或信号转换。
B.
切换控制电路，命令电动机及其他控制对象的起动、停止或工作状态的变换。
C.
当电路发生短路或严重过载时，切断电路，起到保护作用。
D.
对电路进行保护
【简答题】阅读短文，判断正(T)误(F)。 Last weekend, John and his parents went to a park. In the park, John met his classmates. They played chess. They climbed a mountain. They went fishing, too. John and his parents had l...
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