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【单选题】
下面关于发动机气流描述正确的是（）A.
风扇空气是主气流，流经核心发动机空气是次级气流
B.
主气流是流经核心发动机的，次级气流是风扇空气
C.
主气流是流经发动机的空气，次级气流是发动机的引气
D.
主气流是流经发动机的空气，次级气流是没有流经发动机的空气
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【简答题】Which of the following transport mode is suitable for the door to door transport?（ ）
【单选题】Which of the following is intermodal transport?
A.
Water transport.
B.
Air transport.
C.
Truck transport.
D.
Transport with several modes.
【单选题】In a data communication system, which transport media can be described as following: Has two classes: single mode and multiple mode with higher transmit rate with the best reliability
A.
radio channel
B.
fiber optic cable
C.
twisted-pair cable
D.
coaxial cable
【单选题】Which of the following transport mode is suitable for the door to door transport?
A.
Sea/air
B.
Mini-bridge
C.
Piggyback
D.
Land bridge
【简答题】when the system upon which a transport entity is running fails and subsequently reatarts，the（）information of all active connections is lost.the affected connections become half-open，as the side that d...
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