要将一个数字字符串转换成对应的数值，应使用的函数是
A．Val
B．Single
C．Asc
D．Space
参考答案：A
The book I bought from the bookstore isn’t here. Who __________?
A．could have taken it
B．must have taken it
C．might take it
D．should take it.
对于奥氏体不锈钢，应尽量减少（），使之形成（）的奥氏体组织。
