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【判断题】
电压致热型设备的缺陷一般定为严重及以上的缺陷。( )A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】有语法规则如下: F→F+E | id , E→ E*E | (F) | id 下列句子中,不符合以上规则的是
A.
id
B.
id+id
C.
id*
D.
id+id*id
【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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