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【简答题】
密码锁控制,有一密码锁设有允许开锁键K1,密码键K2和K3,复位键K4,K1键按下后,允许开锁,K2键连续按3次和K3键连续按2次,锁才能打开,锁打开后按下复位键K4,锁又自动锁住,假设锁舌由直流线圈驱动,线圈得电锁打开。线圈失电锁锁住,试用PLC实现此功能,写出I/O地址分配并设计梯形图程序。
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皮皮学刷刷变学霸
举一反三
【单选题】Which one of the following items is NOT a main purpose of an analogy?
A.
make a statement more vivid
B.
make a statement more humorous
C.
use familiar or concrete things to illuminate new abstract concepts
D.
classify or illuminate a concrete concept with an abstract concept
【单选题】The main purpose of Paragraph 3 is to
A.
examine how one of Aesop's fables sheds light on certain facets of Greek belief.
B.
dissect one of Aesop' s fables in order to study the elements that make up Greek mythology.
C.
learn from the lesson Presented in one of Aesop' s most well-known fables.
D.
illustrate a fable typical of Aesop' s style, so as to examine how one goes about studying the meaning behind it.
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