289、当通风空气温度升至 30℃时,排气阀打开。
答案解析
解析：
相关知识点：
通风温到30℃，排气阀打开
相关题目
1172、For Handbooks that are not FAA Approved Airplane Flight Manuals the following statement. ins
1171、把补片剪到正确的尺寸。
1170、NOTE and its related examples deleted.
1169、Complex sentence structure and the large number of meanings and synonyms that many Englishwords have can cause confusion.
1168、Apply two layers of protective compound to prevent hydraulic fluid damage to the sealant.
1167、很难确定腐蚀的影响，但是如果收到持续适航大纲检查报告，检查时间将根据任何严重的问题进行调整。
1166、 You can write descriptive text in the active voice.
1165、如有必要，加一个垫圈。
1164、You can do the test in two different ways： either with the Central Maintenance Computer, System viathe MCDU，like you have probably learned already, or with a test switch on the VOR receiver in the avionicscompartment.
1163、Troubleshooting information describing probable malfunctions, how to recognize those malfunctions, and the remedial action for those malfunctions shall be provided.
