Acid rain is not straightforwardly attributable to the burning of coal.酸雨并非简单地由烧煤造成。Nor is acid rain always, and universally, a bad thing.酸雨也并非在任何情况下都是坏事。Cars cause pollution, both smog and acid rain.汽车造成的污染既有烟雾也有酸雨。...
工厂经理用一幅作业图来说明生产过程.The factory manager used a flowchart to explain the production process.以轴类零件图为例,详细分析了作业图批改的若干关键技术,并给出了相应的算法和程序流程图.The application of all solutions and algorithms were illustrated with a typical shaft - ...