继电器用来构成 ,用继电器接点可构成各种信号控制电路,将信号机、转辙机、轨道电路等有机的连接起来,完成严密的联锁关系。 A. 逻辑关系
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【简答题】Blank-filling Questions 26 to 35 are based on the following passage. Children do not think the way s do. For most of the first year of life, if something is out of sight, it's out of mind. If you...
【简答题】Questions 26 to 35 are based on the following passage. Children do no t think the way s do. For most of the first year of life, if something is out of sight, it's out of mind. If you cover a ba b...
【简答题】在下列各句的空白处填入一个最恰当的单词,使句子意思完整,语法正确。 1. It's a teacher's_________to teach the students well. 2. You shouldn't worry about your problems. You should_________the challenges instead. 3. Worrying about ou...
【单选题】听力原文:M: It's so hot in here! W: It's noisy too, but the music is great! M: Yes, I like this record very much. Do you come here often? W: Now and again at weekends. !How about you? M. This is the secon...
【单选题】听力原文:Sue: Have you been to the new sports centre, Jim? Jim: Yes, Sue. it's not cheap but it's big and light. Sue: Does bus eighteen go there? Jim: That's right. It takes fifteen minutes. Don't get bus...