筑物变形的原因有哪些?
参考答案:
(1)自然条件的变化(即建筑物地基的工程地质、水文地质、震动、风力、温度和地下水位变化等),
(2)建筑物本身的自重及荷载等。
A portfolio manager is looking at an investment that has an expected annual return of 10% with a standard deviation of annual returns of 5%. Assuming the returns are approximately normally distributed, the probability that the return will exceed 20% in any given year is closest to:()
A. 0.0%.
B. 4.56%.
C. 2.28%.
仪器设备已损坏须报废,或经检定不合格须报修,或已超过检定周期,或因客观因素长时间不使用,用()标识表示停用。
A.红色
B.黄色
C.蓝色
D.绿色