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【单选题】Check-in Requirements Passengers and their baggage must be checked in at least 45 minutes before departure for domestic flights and 60 minutes for international flights. Government-issued photo ident...
A.
To pay extra money.
B.
To ask for special permit.
C.
To carry it themselves.
D.
To drop the excessive item.
【单选题】飞机在超重条件下飞行，会有哪些不利的影响（）
A.
静态结构的损坏和气动不稳定性
B.
缩短飞机的疲劳寿命
C.
增加燃油消耗和带来跑道的损坏
D.
以上全部
【单选题】下列关于超重与失重的说法，正确的是 [ ]
A.
游泳运动员仰卧在水面静止不动时处于失重状态
B.
在超重现象中，物体的重力是增大的
C.
处于完全失重状态的物体，其重力一定为零
D.
如果物体处于失重状态，它必然有向下的加速度
【单选题】Passage 1Check-in RequirementsPassengers and their baggage must be checked in at least 45 minutes before departure for domestic flights and 60 minutes for international flights. Government-issued phot...
A.
20 minutes before departure
B.
30 minutes before departure
C.
45 minutes before departure
D.
60 minutes before departure
相关题目：
【单选题】Check-in Requirements Passengers and their baggage must be checked in at least 45 minutes before departure for domestic flights and 60 minutes for international flights. Government-issued photo ident...
A.
To pay extra money.
B.
To ask for special permit.
C.
To carry it themselves.
D.
To drop the excessive item.
【单选题】飞机在超重条件下飞行，会有哪些不利的影响（）
A.
静态结构的损坏和气动不稳定性
B.
缩短飞机的疲劳寿命
C.
增加燃油消耗和带来跑道的损坏
D.
以上全部
【单选题】下列关于超重与失重的说法，正确的是 [ ]
A.
游泳运动员仰卧在水面静止不动时处于失重状态
B.
在超重现象中，物体的重力是增大的
C.
处于完全失重状态的物体，其重力一定为零
D.
如果物体处于失重状态，它必然有向下的加速度
【单选题】Passage 1Check-in RequirementsPassengers and their baggage must be checked in at least 45 minutes before departure for domestic flights and 60 minutes for international flights. Government-issued phot...
A.
20 minutes before departure
B.
30 minutes before departure
C.
45 minutes before departure
D.
60 minutes before departure
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