Several species of Verbal Contract were anciently in use, but the most important of all, and the only one treated of by our authorities, was effected by means of a stipulation, that is, a Question and Answer; a question addressed by the person who exacted the promise, and an answer given by the person who made it.

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Experiments of flow conductivity closure stress of typical propping agent are done, propping agent short-term flow conductivity alteration index is defined, by this, the relation between fissure short-term flow conductivity and closure stress, it is close to exponential relation. 4. Establishing the mathematical simulator of hydraulic fractured well's production in a steady state, finding the relation curve between dimensionless flow conductivity and fracture penetration coefficient by means of calculation and analyses, it is the basis of hydraulic fracture. 5. Expatiating the importance of optimized hydraulic fracturing design in reservoir engineering, advancing the optimizing design method, fracture dimension can be calculated easily when the physical parameters are known. 6. Production rate decline standard curve of vertical fractured wells is achieved by mathematical simulation, when the flow pressure is certain , by asymptotic analyze, this decline curve is close to exponential relation.

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The teaching contents and teaching purposes are determined by the cultural aims and professional qualities, the teaching media are befittingly chosen depended on teaching contents and student's characteristics, the keystones and difficulties of class teaching are broken through by selecting the cut-in points of applying modern educational technology, the shortages of facilities are supplied by applying modern educational technology to create the simulative situations, the level of applications are increasingly improved by means of receiving student's feedbacks, all of which are discussed so that expatiate how to apply modern educational technology to planting courses.

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In advance of reviewing probability for Senior Three students, the author gave an exam of probability. On the basis of analyzing the results, the author carried out a group of teaching strategies, the author reviewed the definition of Frequency by computer imitation trials and Equiprobability models by various Probability models, and distinguished Exclusive Events and Independent Events by examples, and described Variable Distribution by means of various Probability models.

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In another word, the status does not exist that a painter should learn from nature "purely" without any "prejudice" and paint realistically by facing an object to paint out what he or she has perceived. To obtain such capability, painting learners or students shall use their eyes (teachers ask students in the painting class "where are your eyes and your perceptions") to observe objects and things at the beginning of study and then paint the models faithfully by means of "facade-subdivision"(or "preferring to square not round" as described by Xu Beihong, or decomposing the object into many petty facades as described in the line drawing textbook by P.P. Chistjakov so as to turn around the object bit by bit).

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