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【多选题】
关于美国大学的学位正确的说法是A.
有两年制的副学士学位
B.
硕士、博士学位可分为学术型和专业型
C.
学士学位一般为3年
D.
获得博士学位需要通过博士资格候选人考试
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【简答题】典型的高功率光纤激光加工系统一般包括五个基本单元：高功率光纤激光器系统、运动机构、控制系统、准直与聚焦系统、[填空（1）]。
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