皮皮学，免费搜题
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【多选题】
幼儿文学的写作者应该具备哪些特点A.
童心
B.
爱心
C.
游戏精神
D.
爱读书
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
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【单选题】Two rats are given exactly the same amount of electric shock. However, one rat hears a buzzer 10 seconds before each shock, while the other rat hears nothing. Which rat do you think has a worse physic...
A.
the rat that hears the buzzer and knows that the shock is coming
B.
the rat that gets no warning and cannot predict when the shock is going to come
【简答题】三相电路端线与端线之间的电压称为( )。
【简答题】三相电源端线与中线之间的电压称为( )。
【简答题】识字率 _________ rate