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【判断题】
顺序功能图由梯形图块和SFC块组成;SFC块又由步、有向、转换、转换条件、动作或命名组成。( )A.
正确
B.
错误
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】气门组是由气门、气门座、气门导管气门弹簧、锁片组成,头部用来封闭气缸的进、排气通道,杆部主要为气门的运动导向,尾部制有凹槽_____、环形槽用来安装锁紧卡簧。
【单选题】听力原文：W How was your interview at Creston Securities? M I think it went well. I'm anxious to hear from them. Working for Creston has always been a dream of mine. W I'm sure it went well. You have so mu...
A.
Trading stocks
B.
Working overtime
C.
A job interview
D.
A new company policy
【单选题】听力原文：W: Hi, John. How was your vacation? M: Great! I went to New York. W: Really? Why did you decide to go there? M: Well, I went there on business. I also have a friend who lives there. She's been tr...
A.
To deal with some business on work.
B.
To go to see a friend.
C.
To visit some beautiful places.
D.
To enjoy himself.
【多选题】怀孕是一个复杂而微妙的生理过程,受孕的必备条件包括哪些?( )
A.
男方性功能正常及有正常的精子
B.
有健康的卵子
C.
在排卵期前后一定时间内夫妇间进行正常的性生活
D.
受精卵在形态及功能正常的输卵管的帮助下进入宫腔
E.
有一个好子宫，有很好的子宫内膜
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