转轮是直接水流能量转换为主轴旋转机械能的部件。
参考答案：对
试分析广告受众审美接受心理的特征。
The visit to the parents in the countryside, originally due to be paid last Sunday, was finally ________
because of the bad weather.[ ]
A. set off
B. called off
C. broken off
D. taken off
