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【简答题】
试用继电 - 接触器控制方法和 PLC 控制方法设计一条自动运输线的控制线路,运输线由两台鼠笼式三相异步电动机拖动, M1 拖动运输机, M2 拖动卸料机,其动作过程如下: ( 1 ) M1 先启动,经 15s 后, M2 才能启动( M1 、 M2 均需单独启动按钮); ( 2 ) M2 停止后,才允许 M1 停止( M1 、 M2 均需单独停止按钮)。 ( 3 )若其中任何一台电动机发生过载,两台电动机均停车。 设计要求: ( 1 )用继电 - 接触器控制方式设计,要求画出主线路、控制线路和必要的保护环节,并说明控制电路图中各电器元件的作用。 ( 2 )用 PLC 控制方式设计,要求进行 I/0 分配并绘制 PLC 外部接线图和控制梯形图。
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【简答题】构成机构的要素是 和 ;构件是机构中的 单元体,而零件是机器中的 单元体。
【单选题】听力原文：W: Hi, Burt. I heard you're looking for a new job. How is it going? M: I just had an interview yesterday. I think I did well. The director seemed to like me. They said they would make a decision ...
A.
He will probably fail.
B.
The chance is half-and-half.
C.
He will probably get the job.
D.
He is not satisfied with the offer.
【单选题】---Would you like tea or coffee? --- I need of them. I just had a large glass of water 5 minutes ago.
A.
neither
B.
either
C.
none
【单选题】Jenny suggested our going on an outing to the countryside next weekend, but the rest didn’t sound very _________ about the idea.
A.
anxious
B.
enthusiastic
C.
cautious
D.
secure
【单选题】- Perhaps you don't believe it. I just had a close call. ( )
A.
What happened?
B.
Who called you?
C.
Was it from your close friend?
【单选题】听力原文：W: Can you help me? The battery is dead. M: I'll be right with you. W: I just had it fixed. I can't understand why it happened again. What does the woman mean?
A.
She can't wait for service.
B.
She loves her car dearly.
C.
She's annoyed with the frequent breakdown.
D.
She'll have to change the battery herself.
【简答题】构件是机构中的 单元体。
【简答题】构件是机构中的 单元体，而零件是机器中的 单元体。
【单选题】Jenny suggested our going on an outing to the countryside next weekend, but the rest didn’t sound very _________ about the idea.
A.
enthusiastic
B.
cautious
C.
anxious
D.
secure
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