只存在结构承载能力的极限状态,结构的正常使用不存在极限状态。
参考答案:错
Which of the following statements about forward and future contracts is FALSE()
A. A future requires the contract purchaser to receive delivery of the good at a specified time.
B. A predetermined price to be paid for a good is a necessary requirement in the terms of a forward contract.
C. The primary difference between forwards and futures is that only futures are considered financial derivatives.
键“B18—100”的标注中,“100”的含义是()。
A.平头普通平键
B.键宽100mm
C.键长100mm
D.圆键