第十二章 转向系统：讲述了转向系统的基本原理、齿条齿轮式和循环球式转向机构以及动力转向系统。12.1转向系统工作原理:讲述了转向系统的基本原理、常见的转向装置和转向比的概念。[判断题]The lower steering ratio gives the steering a quicker response.（ ）选项:[对, 错]
12.2节动力转向系统:讲述了动力转向系统的工作原理、回转式叶片泵和回转阀的工作原理。
[判断题]The pump moves much more fluid than necessary when the engine is running at faster speed.（ ）选项:[错, 对]
[判断题]A driver can use the steering system to control the position of a car's front wheels.（ ）选项:[错, 对]
[判断题]The rack-and-pinion gear set converts the rotational motion of the steering wheel into the linear motion.（ ）选项:[错, 对]
[判断题]The rack-and-pinion gear set provides a gear reduction.（ ）选项:[错, 对]
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