模板类型较多，适用于现场浇筑大体量筒仓的模板是（ ）。
A．组合模板
B．大模板
C．台模
D．滑升模板
参考答案：D
若△ABC∽△DEF，且∠A=∠E，AB=DF=6，BC=5，AC=4，则DE=______．
Prior to expiration, the maximum value of an Americana call option and an American put option, respectively, is closest to the: American put optionAmerican call option ①A. Exercise price Exercise price ②B. Exercise price Underlying price ③C. Underlying price Exercise price
A．
B．
C．
