拉线过程中一般采用高频焊对线材进行焊接。
错误
暂无解析
我国进出口商品检验机构的主要职责是______
外贸立法管理手段的特点有______
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Hiswholeschooleducation________only2yearsbecauseofhisillness.
__________twenty-fifthofDecemberis__________ChristmasDay.
