因此研究离合器的接合规律和制定离合器的接合控制策略是本论文的重点和难点内容。
So, the study of the engaging law and control strategy is the important and difficult point of this paper.
第二至四章为第二部分，这三章阐释和建构弗洛姆人学思想体系，是本论文的重点和难点。
The Second part is made up of Chapters 2-4. This part is the focus of the dissertation which expounds and systemizes Fromm's theory of Hominology.
用G代码编制该零件的数控加工程序，并附以编程尺寸的计算方法，其中零件工艺规程的分析是此次论文的重点和难点。
G code index this part of NC program, and report to the programming of the calculation method, where the part process analysis is the focus of this and difficulty.
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