题目内容
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提问人：网友xuming1987
发布时间：2022-01-07
[主观题]
COMAC has several Chinese companies as its launching partners, including East Airline, Air China and so on.（）
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A university has several departments. Each department has several classes and research institutes. Each research institute has several staff members, among which some professors and associated professors supervise some postgraduates. Each class has several students. Each student can opt several courses and each course can be opted by several students. （1）Create corresponding concept model using noun/verb method. （2）Convert the concept model from Question 1 to corresponding database model, described by tables.
= 110 MPa , calculate the required section modulus S. Then select the most economical wide-flange beam (W shape) from Table F-1(b) in Appendix F, and recalculate S, taking into account the weight of the beam. Select a new beam if necessary. (b) Repeat part (a), but now assume that the design requires that the W shape must be used in weak axis bending (i.e., it must bend about the 2–2 (or y) axis of the cross section).
