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D、克莱门森还原反应

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D、苯甲醛与查尔酮的迈克尔加成反应

Lesson 16 T or F-1[音频]The longest runway is requested due configuration problem. ( )

A. 对
B. 错

Lesson 16 T or F-2[音频]Radar assistance is requested due to unreliable airspeed indication. ( )

A. 对
B. 错

Lesson 16 T or F-3[音频]SIA is told to vacate the runway via first exit on his right and contact Ground on 121.7 ( )

A. 对
B. 错