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【单选题】
工作的完整性激励的最主要内在机理是?A.
工作积极性
B.
工作成就感
C.
自我控制
D.
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举一反三
【单选题】Scientists have known for some time that certain plants, called hyperaccumu-lators, can concentrate minerals at levels a hundredfold or greater than normal. A survey of known hyperaccumulators identif...
A.
To provide examples of plant types that cannot tolerate high levels of harmful minerals
B.
To show why so many plants are hyperaccumulators
C.
To help explain why hyperaccumulators can be found in so many different places
D.
To emphasize that hyperaccumulators occur in a wide range of plant types
【简答题】磁极间的作用规律 。
【简答题】磁极间的相互作用规律是：同名磁极相互________。
【单选题】But they’ve got to take photos ________.
A.
in designated places
B.
at a certain spot
C.
on a corner
D.
on the ground
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