题目内容
新产品代替老产品之前不需要进行市场调查
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以下哪些时机不适合开展市场调查（）
900 句 T or F748[音频]The thunderstorm ahead is becoming weaker and 10 miles right deviation to the left is requested
900 句 T or F 24 words 446[音频]The flight crew required to make emergency descent to 8000feet because they encountered radpid depressurization.
900 句 T or F (24 words ) 525[音频]Smoke is found to come out of avionics bay and it becomes uncontrollable , so the flight crew wants to fly to final without speed restrictions
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