备件采购周期:易损件(),非易损件(),进口件为()。
参考答案:一个月;三个月;四个月
— Shall we invite Tom to play football now?
— Oh, no. He _____ his clothes. [ ]
A. is washing
B. washes
C. has washed
市场营销计划的编制和执行有哪些步骤?