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【单选题】
飞机的侧向和方向稳定性之间A.
互相独立
B.
必须匹配适当
C.
侧向稳定性好，方向稳定性就差
D.
方向稳定性好,侧向稳定性就好
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举一反三
【单选题】I soon found that the work I was doing had already been done by someone else.________，I was wasting my time.
A.
In other words
B.
In a word
C.
First of all
D.
Believe it or not
【单选题】. I soon found that the work I was doing had already been done by someone else - ________, I was wasting my time.
A.
in a word
B.
in all
C.
in other words
D.
in words
【简答题】Skin-diving( 潜水 )is a new sport today. This sport takes you to a new wonderful world. It is like a visit to the moon! When you are under the water, it is easy for you to climb big rocks ( 岩石 ),because...
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