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Since the design requirements for hand calculating complex, difficult and therefore evaluation method-oriented volume, it is difficult to grasp the breadth and depth in proposition ended shallow understanding, it is difficult to develop students' professional knowledge and practical skills to achiev

Because the design request is complex, the hand calculated the difficulty is big, therefore the beginning of a book inspection way very difficult assurance, stops after getting a smattering in the proposition breadth and the depth, achieved with difficulty raises the student specialized knowledge an

Due to complex design requirements and hand calculation is difficult, so juanmian evaluation mode is difficult to grasp, in propositions on the breadth and depth of a little of, difficult to develop students ' knowledge and practical skills for teaching purposes.

Due to complex design requirements and hand calculation is difficult, so juanmian evaluation mode is difficult to grasp, in propositions on the breadth and depth of a little of, difficult to develop students ' knowledge and practical skills for teaching purposes.