上下搬动这个开关前风窗玻璃刮水器开始工作。
参考答案：对
129. The researcher collected information, studied it, did a lot of and learnt from the experiences of farmers.
A．experiments
B．explanations
C．experiences
D．Tests
创业过程中，有必要留出一部分现金作为风险资金以备不时之需。
