[简答题]可编程控制器主要由 _、 _、 _、 _组成。

参考答案：中央处理单元,存储器,输入输出单元,电源

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● 路基的湿度类型通常划分为干燥、_______ &nbp;、潮湿、______ &nbp; &nbp;。通常要求路基处于 _______ &nbp; 和 ______ &nbp; &nbp;状态。
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● 根据材料,回答题:&nbp;&nbp;&nbp;&nbp;&nbp;&nbp;&nbp;&nbp;In Britain, people have different attitude to the police. Mot people generally ______26______themand the job they do-although there are certain people who do not believe that the police______ 27______have the power that do.&nbp;&nbp;&nbp;&nbp;&nbp;&nbp;&nbp;&nbp;What doe a policeman actually do? It i not______28______job to decribe. After all, a policeman haa number of job in ______ 29______ . In Britain, he might be in the Traffic Police and ______ 30 ______mot of hitime______ 31 ______up and down main road and motorway. A traffic policeman ha to keep the traffic ______32______and help when there i an accident. A policeman ha to help keep the ______ 33______ , too. If there i a fight or ome other diturbance,we ______ 34 ______the police to come and retore order. And they often have to ______ 35 ______ituation at greatrik to their own ______ 36______.&nbp;&nbp;&nbp;&nbp;&nbp;&nbp;&nbp;&nbp;We expect the police to olve crime, of coure, o an ordinary policeman,______ 37 ______ he i not a detective, will often have to help ______ 38 ______and arret criminal.And ______ 39 ______ do we call when there i an emergency-an air crah, a ______ 40 ______ , a road accident,or a robbery? We call the police.41a policeman ha to be42to face any unpleaant e-mergency that may happen in the ______ 43 ______world.&nbp;&nbp;&nbp;&nbp;&nbp;&nbp;&nbp;&nbp;The police do an abolutely neceary job, they do it ______ 44 ______ well and I upport them, but I do not envy policemen, I do not think that I could ______ 45 ______do the job of a policeman.