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【单选题】
航行于冰区的船舶必须按规范要求进行加强,其加强部位主要有________。1普通货船的上甲板和客船的主甲板;2船壳外板;3舷侧骨架;4首尾结构;5舱壁;6舭部。
A.
①②③④
B.
②③④⑤⑥
C.
①②③⑤⑥
D.
①③④⑤⑥
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A.
on,  on
B.
on, in
C.
in, in
D.
in, on
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B.
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D.
Jesus Christ
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A.
(Fx2+Fz2)1/2,arctan(Fx/Fz)
B.
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(Fx×Fz)1/2,arctan(Fz/Fx)
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A.
焉用亡郑以 陪 邻 陪:增加
B.
朝 济 而夕设版焉 济:救助
C.
若不 阙 秦,将焉取之 阙:侵损,削减
D.
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