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简述皮亚杰的道德发展阶段论。

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简述“三论”提供的基本方法。

The teacher can help the students to read a text by reading it aloud while they follow in their books.()

A. 正确
B. 错误

她是从长沙电视台走出来的,她现在是中央电视台中文国际频道主持人,她是谁?

The satisfactory operation of diesel engine exhaust valves usually depends on()

A. the proper back pressure
B. the cooling water temperature
C. correct timing and proper seating
D. accurate metering and the exhaust temperature

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