On the settlement date of a forward contract:()

A. the short may be required to sell the asset. 

B. the long must sell the asset or make a cash payment. 

C. at least one party must make a cash payment to the other.

组织脱钙是否完全下面检测方法不妥当的是（）。

A.严格根据脱钙的时间推算

B.用针刺组织是否有阻力感

C.脱钙液进行钙盐试验是否有沉淀

D.用镊子可弯曲120°可否回弹

E.脱钙液进行钙盐试验是否透明