Man’s first real invention, and one of
the most important inventions in history, was the wheel. All transportation and
every machine in the world depend on it. The wheel is the simplest yet the most remarkable of all inventions, because there are no wheels in nature—no living thing was ever created with wheels. How, then did Man come to invent the wheel Perhaps some early hunters found that they could roll the dead body of a heavy animal through the forest on logs more easily than they could carry it. However, the logs themselves weighed a lot. It must have taken a great prehistoric thinker a long time to imagine two thin pieces of log collected at their centers by a strong stick. This would roll along just as the logs did, yet it would be much lighter and easier to handle. [判断题]组合臂举高消防车,臂架是由同步伸缩的多节臂+铰接臂组成。(易)
A.正确 B.错误 [单选题]接触网静态设备二级缺陷:达到或超出( )且在限界值以内的。
A.警示值 B.限界值 C.标准值 D.临界值 [填空题]TPM管理全称:______。
[单选题]信号集中监测系统环境状态的模拟量温度监测量程范围是()
A.-5~30℃ B.-10~30℃ C.-5~60℃ D.-10~60℃ [多项选择]当建筑物内同时设有( )时,系统地设计流量,应按同时启用的二者的用水量计算,并取二者之和的最大值。
A. 自动喷水灭火系统 B. 水幕系统 C. 生活用水给水系统 D. 雨淋系统 [单项选择]维生素B12
A. 可抗血小板聚集和抗血栓形成 B. 主要用于肝素过量引起的出血 C. 直接激活纤溶酶原转变为纤溶酶,起到溶血栓作用 D. 主要用于恶性贫血和巨幼红细胞性贫血 E. 用于香豆素类引起自发性出血的解救 [判断题]车站应按区域或分片组织候车。对老、幼、病、残、孕及带有婴孩的旅客,应组织提前进站上车。
A.正确 B.错误 [多选题]对采取人机分工或人工检查方式进行列检作业的到达、中转列车,TADS动态检车员须查看该列车TADS预警信息,将()或()信息报文内容通知列检值班员。
A.二级预警 B.一级预警 C.联网预警 D.三级预警 [单项选择]关于绝经期的调护,下列哪项不重要()
A. 多宣传,多关怀 B. 勤清洁,讲卫生 C. 适劳逸,当运动 D. 慎起居,适寒温 E. 调情志,节饮食 [单项选择]与下叶基底段发病关系最密切的体位是()
A. 仰卧位 B. 俯卧位 C. 直立位或坐卧位 D. 右侧卧位 E. 左侧卧位 [单项选择]以下程序的输出结果是( )。 #include <stdio.h> #include<string.h> mam( ) { char b1[8]="abcdefg",b2[8],*pb=b1+3; while(--pb>=b1) strcpy(b2,pB) ; printf("%d/n",strlen(b2)); }
A. 8 B. 3 C. 1 D. 7 [单选题]() 决定了电磁阀的密封结构。
A.工作压力 B.介质性质 C.工作温度 D.功耗大小 [判断题]工艺管线水冲洗应采用分段冲洗方法,上段合格后再冲洗下段,在泵的入口拆下排放。()
我来回答: 提交
|