The entrepreneur at twenty-five is a different animal from the entrepreneur at fifty.25岁的企业家和50岁的企业家是两种不同的人。An entrepreneur is more than just a risk taker. He is a visionary.企业家不仅要能承担风险，还应富于远见。The entrepreneur takes busi...
作为精密的压力计,必须具有微调读数装置.For precision manometes it is necessary to use vernier reading devices.浮钟式压力计可以用来测量计示压力或差压力.Bell gages may be used to measure gage pressure or differential pressure.最简单的压力计,是开管流体压力计.The simplest type ...