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【单选题】
Haley thinks that ______A.
writng is in fact a lonely, private and poor-paying affair
B.
only those who succeed in writing know neglect and poverty
C.
As long as you work hard at writing your works will achieve recognition
D.
only those whose longing is never requited know long periods of neglect and poverty
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【单选题】Which radio equipment is not necessary for the ships sailing in the sea area A1?
A.
NAVTES receiver
B.
VHF EPIRB
C.
406MHz EPIRB
D.
VHF DSC
【单选题】“由光学系统及探测器即光电转换器件组成。它完成对条码符号的光学扫描，并通过光电探测器，将条码条空图案的光信号转换成为电信号。”这是说的条码识读系统中的哪个部分？
A.
扫描系统
B.
信号整形
C.
译码部分
D.
编码部分
【多选题】Which of the following are correct descriptions of Duct center girder箱形中桁材(also called Duct Keel箱形龙骨)?
A.
It is a watertight box structure composed of two symmetrical trusses(对称桁架) on both sides of the bottom center line, the inner bottom plate, the bottom plate and other aggregates(骨材).
B.
It is generally arranged between the E/R bulkhead and the anti - collision bulkhead (防撞舱壁).
C.
The Duct Keel can also be used to centralize the distribution of various pipelines and electrical cables in order to protect and maintain the equipment and avoid the pipeline passing through the cargo hold to impact loading and unloading.
D.
A watertight manhole and an emergency exit leading to the open deck are arranged in the duct keel, the closing device of which can be operated on both sides.
E.
It is a transverse structure.
【简答题】简述激光激光热加工
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