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搜题
【判断题】
有相对运动的配合间隙配合,无相对运动的配合均选过盈配合或过渡配合A.
正确
B.
错误
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】He has never been to the United Stares,______? [ ]
A.
isn't he
B.
doesn't he
C.
hasn't he
D.
has he
【单选题】He has bread for breakfast every day, ________? [ ]
A.
doesn't he
B.
hasn't he
C.
does he
D.
has he
【单选题】He hardly has breakfast on weekdays, ______? [ ]
A.
doesn't he
B.
does he
C.
hasn't he
D.
has he
【单选题】He has got used to the school life, _____? [ ]
A.
hasn't he
B.
has he
C.
usedn't he
D.
didn't he
【单选题】He seldom has lunch at school, ________?
A.
hasn't he
B.
has he
C.
doesn't he
D.
does he
【多选题】以下关于重组DNA分子导入宿主细胞的说法正确的是
A.
基因导入的方法主要有转化、转染等，也可采用电融合、显微注射和基因枪等技术
B.
微生物细胞、动物细胞、植物细胞等可作为重组 DNA 分子的受体细胞
C.
利用电穿孔、磷酸钙共沉淀法、氯化钙法可将 DNA重组体导入真核细胞
D.
利用化学法、电击法或噬菌体转导可将 DNA 重组体导入微生物细胞
【简答题】移动通信的定义是什么?
【单选题】The boy has little milk every morning, ___________?
A.
hasn’t he
B.
has he
C.
does he
D.
doesn’t he
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