【简答题】机车高温冷却水系统为闭式加压冷却,它与柴油机内部冷却水系统构成统一的循环系统。整个高温冷却水系统的外界空气不通,只有当系统中的水汽压力大于规定值时,安装在膨胀水箱中的压力调节阀才会开启对系统的压力给予调节,使系统中始终保持在一定压力范围内工作,保证高温冷却的()。
【简答题】阅读理解。 Every child has a dream of what they want to be, right? When Renee Butts was little, her dream was to become a volunteer firefighter because her father was one. Sadly, when she was 14, her fathe...
【单选题】对于常数据成员,下面描述正确的是( )。
【判断题】CNG加气站的核心部分,主要包括:近期缓冲回收罐、压缩机组、润滑系统、压缩机和天然气的冷却系统、除油净化系统、控制系统等六部分。(判断题)
【判断题】图片大小处理,可以把大图片处理为小图片,也可以把小图片处理为大图片,效果都是一样的。
【单选题】作用于刚体上的力可沿其作用线移到同一刚体内的任一点,,而不改变该力对刚体的效应,这个公理叫做( )。
【判断题】作用于刚体上的力,可以沿其作用线移动到该刚体上的任一点,但会改变它对刚体的作用效果。( )A. 对 B. 错
【单选题】Which of the following statements is true about user-generated content?
A.
It is driven by people and technology and does not require processes and data.
B.
It powers the generation of content in what has come to be known as Web 1.0.
C.
It makes up most of the information in systems such as eBay, Craigslist, and Wikipedia.
D.
It is often produced by professionals with the expectation of profit or remuneration.