请绘图说明PLC控制系统设计的一般步骤

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问题:

请绘图说明PLC控制系统设计的一般步骤

考点:综采维修电工综采维修电工(技师)综采维修电工(技师)题库
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属于上运动神经元行瘫痪的体征是()。

A.运动觉消失

B.肌张力减低

C.Babinski征阳性

D.显着的肌萎缩

E.肌束颤动

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不定项选择
关于物体的惯性,下列说法中正确的是(   )
A.运动速度大的物体不能很快地停下来,是因为物体速度越大,惯性也越大

B.静止的火车启动时,速度变化慢,是因为静止的物体惯性大的缘故

C.两物体质量相等,惯性一定相同

D.在宇宙飞船中的物体不存在惯性

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Mini Book Excerpts (节选)

Biography

When Salinger learned that a car park was to be built on the land, the middle-aged writer was shocked and quickly bought the neighboring area to protect it… The townspeople never forgot the rescue and came to help their most famous neighbor.

J. D. Salinger: A Life by Kenneth Slawenski (Random House, $27)

Mystery (疑案小说)

"You're a smart boy. Benny's death was no accident, and you're the only who saw it happen. Do you think the murderer should get away with it?" The boy was staring stubbornly at his lap again.

A thought suddenly occurred to Annika, "Did you …You recognized the man in the car, didn't you?"

The boy hesitated, twisting his fingers, "Maybe," he said quietly.

Red Wolf by Liza Marklund (Atria Books, $25.99)

Short Stories

She wants to say to him what she has learned, none of it in class. Some women are born stupid, and some women are too smart for their own good. Some women are born to give, and some women only know how to take. Some women learn who they want to be from their mothers, some who they don't want to be. Some mothers suffer so their daughters won't. Some mothers love so their daughters won't.

You Are Free by Danzy Senna (Riverhead Books, $15)

Humor

Do your kids like to have fun? Come to Fun Times! Do you like to watch your kids having fun? Bring them to Fun Times! Fun Times!'s "amusement cycling" is the most fun you can have, legally, in the United States right now. Why spend thousands of dollars flying to Disney World when you can spend less than half of that within a day's drive of most cities?

Happy: And Other Bad Thoughts by Larry Doyle (Ecco, $14.99)

小题1:If the readers want to know about the life of Salinger, they should buy the book published by ________.

A.Ecco

B.Atria Books

C.Riverhead Books

D.Random House小题2:The book Happy And Other Bad Thoughts is intended for ________.

A.young children

B.Disney World workers

C.middle school teachers

D.parents with young children小题3: Which book describes women with characters of their own?

A. Happy And Other Bad Thoughts

B. J. D. Salinger: A Life

C. You Are Free

D. Red Wolf

小题4: After finishing the book Red Wolf, the readers would learn that ________.

A.the boy helped arrest the murderer

B.Benny died of an accident

C.the murderer got away with the crime

D.Annika carried out the crime

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城市化的概念包括( )两方面的含义。

A.无形的城市化,有形的城市化

B.物化了的城市化,无形的城市化

C.郊区城市化,逆城市化

D.外延型城市化,飞地型城市化

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某工程的网络计划如图1所示,图中每根箭线上方数值为该工作每月计划投资(万元/月),下方数值为该工作持续时间(月)。工程进行到第10个月底的时候检查了工程进度。

图1 某工程的网络计划图(单位:月)

[问题]

在图2中将该网络计划转化成时标网络计划(按最早开始时间绘制),并指出该网络计划的计算工期、关键线路和工作⑦→⑨、④→⑧、②→④的总时差和自由时差。

图2 时标网络计划图

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