In what condition we would allow 5% discount If you purchase our product ______.
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进程可以并发执行,若干个并发执行的进程交替占用处理器,而进程各种状态的转换不是事先预定的,也不是完全由操作系统来确定的,而是在硬件和操作系统的相互配合下完成的,起主要作用的是______。
How is the payment to be made Payment has to be made no later than ______.