皮皮学，免费搜题
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【简答题】
稀土元素共有( )个元素,包括镧系( )个元素。
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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】After leaving home the writer began to feel______．
A.
she still needed her mother' s support
B.
it was her turn to take care of her mother
C.
her mother was sick and should see a doctor
D.
it was somewhat cruel to leave her mother alone at home
【单选题】As the time taken to change the wheel be came longer the writer began to feel more().
A.
sorry for the man and the girl.
B.
critical of the man and the girl
C.
unwilling to pay the man and the girl
D.
grateful towards the man and the girl
【单选题】下列哪项是建立管理信息系统的前提
A.
一定的科学管理的基础
B.
领导的重视和主要管理者的支持
C.
管理信息系统的专门人才
D.
开发和应用管理信息系统的总体规划
E.
良好的信息管理基础
【单选题】我国的知识产权制度保护了发明者的创造并赋予发明人一定的权益，使发明者能设计创造出更多更好的新产品。下列不属于知识产权保护范围的是（）。
A.
经营权
B.
著作权
C.
专利权
D.
商标权
【单选题】The writer began to love her mother's desk ______.
A.
after mother died
B.
before she became a writer
C.
when she was a child
【单选题】As the time taken to change the wheel became longer the writer began to feel more .
A.
sorry for the man and the girl
B.
critical of the man and the girl
C.
unwilling to pay the man and the girl
D.
graceful towards the man and the girl
【单选题】The writer began to practise doing gym exercises off the diving board ________.
A.
in 1976
B.
in 1971
C.
in 1970
D.
in 1972
相关题目：
【单选题】我国的知识产权制度保护了发明者的创造并赋予发明人一定的权益，使发明者能设计创造出更多更好的新产品。下列不属于知识产权保护范围的是（）。
A.
经营权
B.
著作权
C.
专利权
D.
商标权