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【单选题】
组织培养的培养室的环境条件对多数作物来说一般应控制在()情况下A.
选择1 25±20 C的温度，70-80%的相对湿度
B.
选择2 25±20 C的温度，70-80%的相对湿度，光照12-16小时，光强1000-5000lx
C.
选择3 30±20 C的温度，80-100%的相对湿度
D.
选择4 30±20 C的温度，80-100%的相对湿度，光照12小时，光强3000-8000lx
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反馈参考答案：
举一反三
【单选题】听力原文：M: When does the plane take off? F: It has been arranged to take off at four fifteen but it's delayed thirty minutes. ● For questions 1-8 you will hear 8 short recordings. ● For each question, ma...
A.
4:25
B.
4:35
C.
4:45
【判断题】Disabled passengers must be seated in the same section ,includesthe forward, the aft and the mid part of the cabin.
A.
正确
B.
错误
【判断题】Disabled passengers must be seated in the same section ,includes in the forward in the aft and in the mid part of the cabin.
A.
正确
B.
错误
【简答题】Does an airline have a_____________(限制)on the number of disabled passengers on a flight?
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