凭对等样品成交实际上是将凭买方样品成交转为凭卖方样品成交。
参考答案：对
We are in ______, but we are in ________.[ ]
A. the same school, different class.
B. the same schools, different classes.
C. the same schools, different class.
D. the same school, different classes.
在Visual FoxPro中，日期型常量的定界符是______。
A．单引号
B．双引号
C．方括号
D．花括号
class.