若将二水石膏置于0.13MPa、124℃的过饱和蒸汽条件下蒸炼脱水,就可以得到()。
A.α型半水石膏
B.β型半水石膏
C.建筑石膏
D.不溶性硬石膏
参考答案:A
A stock priced at $100 has a 70 percent probability of moving up and a 30 percent probability of moving down. If it moves up, it increases by a factor of 1.02. If it moves down, it decreases by a factor of 1/1.02. What is the probability that the stock will be $100 after two successive periods()
A. 9%.
B. 42%.
C. 21%.
下列哪项不是五味子的性状特征()
A.呈不规则球形或扁球形
B.表面棕红色至暗棕色,干瘪,皱缩
C.种子肾形,表面有光泽
D.果肉气微,味酸
E.有的表面呈黑红色或出现"白霜"