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定积分和不定积分是一回事，只是名字不同而已
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“二十公”以来，正规化建设持续健康发展，取得了突出成效主要表现在（ ）。
The roof of the residential building was constructed in August. The waterproof coiled material was paved during the day. It was found that the waterproof coiled material was bulging and leaking during the acceptance after the construction. Explain the causes of the above engineering problems.
The durability of concrete is the comprehensive performance of its resistance to various adverse factors in the working environment, including water penetration, freeze-thaw, carbonization, erosion and so on. Please list the specific measures to improve the durability of concrete.
The stone masonry pool has leakage due to the mortar joint. The leakage problem is solved after the cement-based waterproof coating is applied as a whole. However, when the same waterproof coating is used to waterproof the basement due to foundation cracking, the leakage problem has not been solved. Please explain the reasons for the above problems.
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