题目内容

高频焊的特点是什么?

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1997年中国残联与哪两个部门联合下发了《关于做好盲人保健按摩职业技能培训、鉴定及就业工作的通知》?

As we know, blood types A and B cannot receive AB, but AB may receive A or B. Type O can give to any other group; hence it is often called the() donor.

A. general
B. popular
C. universal
D. commo

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