由存货仓库、销售部门向采购部门提出商品采购申请并编制的单据是()
A. 请购单
B. 订单
C. 定单
D. 验收单
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Ami, I want this report typed today.()
A. It‘ll be ready in the afternoon, sir.
B. I‘d like you to help me.
C. I know nothing about the report.
D. Leave it to tomorrow.
一般负地闪首次回击的峰值电流平均值为?()
A. 20~40A
B. 50~80kA
C. 20~40kA
D. 50~80A