设计一个 Web 应用程序,程序启动后显示如下图所示的界面,用户在输入一个角度值后单击“ sin ” , “ cos ” , “ tan ”或“ cot ”按钮,可得到对应的三角函数值;单击“重置”按钮,可清除用户上次的输入及计算结果,并将插入点光标移到文本框中。 如果用户没有输入角度值而单击了任一个三角函数按钮,将显示如下图所示的出错提示信息。
【简答题】Exercise 2 China’s rail diplomacy Directions: you will hear a piece of newsabout China’s rail diplomacy. Please supply the missing information of the newsreport. Two examples of rail lines built by Ch...
【简答题】Match the persons to their actions. 1. Why do people make __________ ( expenses / budgets )? 2. A budget keeps track of how much money people __________ ( spend / add ) in relation to how much they ea...
【简答题】D. Choose the correct words to complete the sentences 1. Why do people make __________ (expenses / budgets)? 2. A budget keeps track of how much money people __________ (spend / add) in relation to h...
【简答题】Nancy has taught a 1 ______of ages of children, for example, 3-year-olds and preschool children and fifth, fourth and first grade at the elementary level. What is stressful about her job is that child...