主页
学科
搜索
账户
常见问题
当前学科:压力管道焊工考试
题目:
单选
焊工绝缘手套不得短于()。
A . A、700mm
B . B、500mm
C . C、300mm
答案:
<查看本题扣1积分>
查看答案
答案不对?请尝试站内搜索
推荐知识点:
Commuting to work in Chicago is no【C1】______, for the roads there are even more crowded than in San Francisco. But here is how the city of Chicago is handling the problem. "We dont have rash hours any more," said Charles M. Mclean, who runs the nations busiest road. "We have rash periods, and they keep【C2】______longer and longer. " In Chicago, a【C3】______system has been developed that controls【C4】______the citys seven expressways. Now, one mana controller can【C5】______the movement of Chicagos traffic【C6】______looking at a set of lights. The system uses electronic sensors that are built into each expressway, half a mile【C7】______. Several times a second, the computer【C8】______information from each sensor and translates it into green, yellow or red lights on a map in the control room. "See that red light near Austin Avenue?" the controller asked a visitor, "Thats a repair truck【C9】______the road, and the traffic has to go【C10】______it. " At the Roosevelt Road entrance【C11】______the expressway, the light kept【C12】______from green to red and back to green again. "A lot of trucks get on the expressway there. " the controller explained. "They cant speed up as【C13】______as cars. " The sensors show【C14】______where an accident or a stopped car is blocking traffic,【C15】______a truck is sent by radio to clear the road. The system has lowered the【C16】______of accidents by 18 percent. There are now 1. 4 deaths on Chicagos expressways for each one hundred million miles traveled,【C17】______in other parts of the country there are 2. 6. Traffic experts say that the Chicago system is the "coming thing". Systems like Chicagos are already in use on some expressways in Los Angeles and Houston. "Chicago has【C18】______the lead," says New York Citys【C19】______director; and he adds, "we are【C20】______".【C1】A.cheerfulB.pleasantC.happyD.pleasure
下列哪项不是癫痫发作的影响因素()。
SPWM波形成的方法有哪些?
下列物质属于离子化合物且含有共价键的是( )A.HClB.NaClC.NaOHD.H2O
配对计量资料,差值分布不接近正态分布,应选用()
X进站信号机开放正线通过信号时,用正线信号继电器ZXJ检查()前接点条件。
论述列检作业中对预报的热轴车,应如何判断处理?
在管道通过障碍时或在工厂区内,为了管理维修方便,采用()敷设方式。
白葡萄酒发酵期为()天左右。
培训是饭店的一项持续不断的重要工作,饭店培训按培训的时间段分类也有很多种,其中作为部门培训重点的是()。