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【单选题】
下列哪项不是乳牙滞留的原因A.
乳牙根吸收不足
B.
乳牙根尖病变引起骨组织破坏,使乳牙滞留原位
C.
乳牙外伤
D.
恒牙先天缺失
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【简答题】用按列选主元的高斯一若当消去法求矩阵A的逆矩阵，其中 中
【单选题】Paul rents out a house which is fully furnished. The house does not qualify as a furnished holiday letting. Paul paid the following expenses in relation to the letting: £ New chairs for garden (not pr...
A.
£1,830
B.
£1,480
C.
£795
D.
£1 ,230
【简答题】The little boy entered the house, unhappy. His mother was 31 cakes in the kitchen. She smiled as she 32 but stopped when she saw his face. “Tyler, 33 happened? Is everything okay?” “Nothing is okay, m...
【简答题】Today is Tuesday. We are having a ___31___ class in the classroom. Ms Chen is telling us what water is like. After that, she asks us “___32_ water like?” No one speaks for __33__ minutes. Ms Chen asks...
【简答题】Christmas is on December 25th. It’s my favorite 26 . In the morning my parents often 27 the house. My brother and I often 28 the Christmas tree with lights. Then we put a star 29 the top(顶部) of the tr...
【简答题】设矩阵 可逆，向量 是矩阵A * 的一个特征向量，λ是α对应的特征值，其中A * 是矩阵A的伴随矩阵，试求a，b和λ的值． 分析 由特征向量的定义，可得一个三元联立方程，由此可解出所求的参数．
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