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简述对线性平移不变系统可采用两种方法研究？

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钢的变形分塑性变形和（）。

Not until this morning（）your delayed letter of credit.

A. we received
B. did we receive
C. we have received
D. had we received

客车闸瓦托各部磨耗运用限度不得大于（）。

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