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Mathematical calculation
This algorithm has been applied for about two thousand years, which has made great contributions to the development of ancient mathematics in China. However, the calculation has a serious disadvantage, that is, it does not keep the operation process. Zhu Shijie, a mathematician in Yuan Dynasty, was able to solve quartic high-order equations by calculation, and his mathematical level was in a leading position in the world. But his method is difficult to understand, and the operation process cannot be saved, so _ _ _ _. China ancient mathematics can't develop modern mathematics, and the _ _ _ of calculation method is an important reason.

The most suitable items to fill in the underlined parts in turn are:

A. nominal bondage

B. Disappeared, one-sided

C. There are no restrictions on successors.

A comprehensive analysis of this topic. First, understanding the joke shows that Zhu Shijie's method is profound, and few people understand it, so it can't be retained and can't continue to develop. It can be seen that the calculation has its existence significance, not "in name only", excluding item A; Disappearing refers to hiding, not appearing in public, having the meaning of active hiding, which is inconsistent in semantics. Excluding item B, item D is unsustainable, indicating that it is difficult to continue, emphasizing the difficulty. The successor of item C says that there is no inheritance, emphasizing no, and planning is no longer the content of modern mathematics and has not been passed down. In contrast, "no successor" is more appropriate. Secondly, the paragraph emphasizes that "the rules and regulations of calculation methods are obstacles to the development of mathematics in China", and the object of constraint is generally freedom. The calculation is only due to the limitation of the method, so it is more appropriate to use the limitation here. So the correct answer is C.