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【单选题】
襟翼不对称是通过什么防止的？A.
可切断襟翼工作的对称系统
B.
机械连接到襟翼上的同步钢索使襟翼工作一致
C.
襟翼控制组件上的一个分流器
D.
没有防止系统
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【单选题】His ability is beyond question; _____ has been in doubt is ____ he is prepared to work hard A．wh
A.
13. His ability is beyond question; _____ has been in doubt is ____ he is prepared to work hard A．what; that
B.
which; whether
C.
what; whether
D.
that; that
【单选题】－－－ How long has he been in the army?－－－ Oh, he joined the army as far ____ as 1997. A．agoB．away
A.
13. --- How long has he been in the army? --- Oh, he joined the army as far ____ as 1997. A．ago
B.
away
C.
from
D.
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【简答题】DBS 的基础是( ),DBS的核心是( )。
【简答题】DBS的基础是( ),DBS的核心是( )。
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