机器人上常用的距离与接近觉传感器有哪些？
参考答案：
超声波，激光、红外，霍尔传感器。
Which of the following statements regarding long-term forecasts of cash flows is most accurate Long-term cash flow forecasts are:（）
A. constructed from recent daily and weekly cash flows.
B. are usually more accurate than short term cash flow forecasts.
C. based on pro-forma balance sheet projections for future years.
军用列车
