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【简答题】
在凸形竖曲线的顶部或凹形竖曲线的底部应避免插入 平曲线。
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反馈参考答案：
举一反三
【单选题】Only when one loses freedom ______its value.
A.
does one know
B.
one does know
C.
does know one
D.
know one does
【单选题】Vessels shall be deemed to be in sight of one another only when one ()from the other.
A.
Can be observed visually
B.
Can be observed by radar
C.
Can be located on the radar
D.
Can be heard
【单选题】Only when one loses freedom ______ its value.
A.
does one know
B.
one knows
C.
one does know
D.
knows one
【单选题】Only when one______the powerful current of the times will one's life shine brilliantly.
A.
dips into
B.
comes into
C.
drops into
D.
plunges into
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