JS响应事件的过程包括（）。

A、列数

B、行距

C、列距

D、行数

A、sqrt(2)

B、pow(2,1.0/2)

C、pow(2,1/2)

D、pow(2,0.5)

Prefab, a furniture manufacturer, uses 20,000 square feet of plywood per month. Its trucking company charges Prefab$400 per shipment, independent of the quantity purchased.The manufacturer offers an all unit quantity discount with a price of $1 per square foot for orders under 20,000 square feet, $0.98 per square foot for orders between 20,000 square feet and 40,000 square feet, and $0.96 per square foot for orders larger than 40,000 square feet. Prefab incurs a holding cost of 20 percent. What is the optimal lot size for Prefab? What is the annual cost of such a policy? What is the cycle inventory of plywood at Prefab? How does it compare with the cycle inventory if the manufacturer does not offer a quantity discount but sells all plywood at $0.96 per square foot?

A、第一阶段设计是关于建筑物正常使用阶段的设计，因为它没有进行防倒塌设计；

B、进行了第一阶段设计并采取抗震措施后，大多数建筑结构可以满足防倒塌的要求；

C、设计的内容是：结构在多遇地震下的弹性地震作用和内力计算；

D、设计内容包括：罕遇地震作用下结构的内力分析和变形验算。