The buyer wants to purchase 75 cubicle desk units by the end of next month.
查看答案
Arthur Mitchell will have the estimate ready for Jane Walsh by the end of the day.
A. 对
B. 错
All shipments in Arthur Mitchell’s company are door-to-door.
A. 对
B. 错
Jane Walsh can expect an e-mail by 4 this afternoon.
A. 对
B. 错
在一个有零因子的环中，下列结论成立的是
A. 右零因子不一定是左零因子
B. 有左零因子一定有右零因子
C. 没有左零因子可能有右零因子
D. 左零因子与右零因子一定同时出现
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