皮皮学，免费搜题
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【单选题】
研究学前儿童心理最基本的方法是( )A.
实验法
B.
测验法
C.
问卷法
D.
观察法
拍照语音搜题，微信中搜索"皮皮学"使用
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【简答题】设计一般闭式齿轮传动时，齿根弯曲疲劳强度计算主要针对的失效形式是______。
【简答题】阅读理解。 Tom and Jim are brothers. They are from Australia. Tom is 14 years old and Jim is 13 years old. They speak English and French. Today they are in China. Now they are living in China. Their home i...
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